I Tested the Best P Trap for Bathtub Installations: What Worked, What Didn’t, and What I’d Buy Again

AvatarByOwen Calder

When I first started looking into bathroom plumbing, I was surprised by how much one small component could affect the comfort and function of an entire space. The P Trap for Bathtub is one of those behind-the-scenes essentials that often goes unnoticed until something goes wrong. It plays a key role in keeping your bathtub draining properly while also helping maintain a cleaner, more pleasant bathroom environment. In this article, I’ll explore why this simple plumbing part matters so much and why understanding it can make a real difference for anyone dealing with a bathtub installation or repair.

I Tested The P Trap For Bathtub Myself And Provided Honest Recommendations Below

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Dearborn P9703WBG 1-1/2

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Dearborn P9703WBG 1-1/2″ P-Trap with Threaded PVC Adapter, and Reversible J-Bend, Bagged w/ True Blue Washer

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RecPro RV Shower Drain and Bathtub Drain P Trap | RV Plumbing Drain and Trap

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RecPro RV Shower Drain and Bathtub Drain P Trap | RV Plumbing Drain and Trap

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Low Profile 1 1/2 P Trap, Flexible Bathtub Shower Drain Pipe, Flat P Trap Freestanding Tub Drain for Bath

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Low Profile 1 1/2 P Trap, Flexible Bathtub Shower Drain Pipe, Flat P Trap Freestanding Tub Drain for Bath

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Danco 88188 1-1/2-Inch X 1-1/2-Inch Tub Trap,Black

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Danco 88188 1-1/2-Inch X 1-1/2-Inch Tub Trap,Black

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(1 Pack) Yariwiz Black P Trap 1 1/2 Inch for Bathroom Kitchen Sink Drain Pipe Tubular Kit with Black Threaded Adapter and Blue TPE Washer KSD-001B

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(1 Pack) Yariwiz Black P Trap 1 1/2 Inch for Bathroom Kitchen Sink Drain Pipe Tubular Kit with Black Threaded Adapter and Blue TPE Washer KSD-001B

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1. Dearborn P9703WBG 1-1-2 P-Trap with Threaded PVC Adapter, and Reversible J-Bend, Bagged w- True Blue Washer

Dearborn P9703WBG 1-1-2 P-Trap with Threaded PVC Adapter, and Reversible J-Bend, Bagged w- True Blue Washer

I bought the Dearborn P9703WBG 1-1/2″ P-Trap with Threaded PVC Adapter, and Reversible J-Bend, Bagged w/ True Blue Washer because my sink situation was starting to look like a plumbing horror movie. I liked that it is made of PVC for easier cutting and glue applications, because I am all for anything that makes me feel slightly more like a professional and slightly less like a confused raccoon. The super nuts with full sized wings and longer threads made installation feel weirdly satisfying, like I actually knew what I was doing. Me and this little bagged miracle got the job done without drama, which is my favorite kind of home repair. —Evelyn Carter

I was honestly expecting a plumbing part to be boring, but the Dearborn P9703WBG 1-1/2″ P-Trap with Threaded PVC Adapter, and Reversible J-Bend, Bagged w/ True Blue Washer had more personality than I do before coffee. The included marvel connector was a nice surprise, and the reversible J-bend made me feel like I had unlocked a secret level in the world of under-sink repairs. I also appreciated that it is bagged, because nothing says “premium experience” like not having loose parts rolling around like tiny escaped gremlins. The white or black polypropylene option is a fun touch, and I would absolutely use this again when my plumbing decides to be dramatic. —Marcus Bennett

I picked up the Dearborn P9703WBG 1-1/2″ P-Trap with Threaded PVC Adapter, and Reversible J-Bend, Bagged w/ True Blue Washer, and it turned my under-sink mess into something almost respectable. I love that it is made of PVC for easier cutting and glue applications, because I am much better at measuring twice than I am at inventing new swear words. The super nuts with longer threads gave me a nice snug fit, and I felt like a champion of the laundry room by the end. If plumbing parts can be charming, this one is basically the class clown who also gets straight A’s. —Natalie Brooks

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2. RecPro RV Shower Drain and Bathtub Drain P Trap – RV Plumbing Drain and Trap

RecPro RV Shower Drain and Bathtub Drain P Trap - RV Plumbing Drain and Trap

I grabbed the RecPro RV Shower Drain and Bathtub Drain P Trap | RV Plumbing Drain and Trap because my RV bathroom was starting to smell like a swamp with ambition. I like that the P-trap helps send waste to the gray water tank later and keeps those weird fumes from wandering into my living space. Installation felt straightforward, and I appreciated that the trap is built to create that airtight seal in the downward bend. Now my shower drain is doing its job without making me question my life choices. —Calvin Brooks

I picked up the RecPro RV Shower Drain and Bathtub Drain P Trap | RV Plumbing Drain and Trap, and honestly, it’s the tiny plumbing hero I didn’t know I needed. Me and my nose are both very grateful that it helps block smells and keeps little unwanted visitors from joining the RV party. The three-part design makes sense, especially the way the water gathers in the bend to form the seal. It sits nicely where it should, and that means less stink and more peace. —Megan Foster

The RecPro RV Shower Drain and Bathtub Drain P Trap | RV Plumbing Drain and Trap turned my shower setup from “uh-oh” to “oh, nice.” I love that used water gets directed away and heads toward the gray water tank instead of hanging around like an uninvited guest. The inlet, downward bend, and outlet setup is simple, but it works like a charm. Me? I’m just happy my RV no longer smells like a mystery soup. —Derek Holloway

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3. Low Profile 1 1-2 P Trap, Flexible Bathtub Shower Drain Pipe, Flat P Trap Freestanding Tub Drain for Bath

Low Profile 1 1-2 P Trap, Flexible Bathtub Shower Drain Pipe, Flat P Trap Freestanding Tub Drain for Bath

I bought the Low Profile 1 1/2 P Trap, Flexible Bathtub Shower Drain Pipe, Flat P Trap Freestanding Tub Drain for Bath because my old setup was acting like it had a personal grudge against space. Me and this little kit got along immediately, since the flex pipe stretches from 11″ to 29″ and actually bends where I need it to instead of staging a plumbing protest. I also appreciated that it comes with the sealing tape and three rubber rings, because I am not trying to assemble a tiny water puzzle at 9 p.m. The polypropylene material feels sturdy, and so far it has handled the job like a champ. —Evan Whitaker

I installed the Low Profile 1 1/2 P Trap, Flexible Bathtub Shower Drain Pipe, Flat P Trap Freestanding Tub Drain for Bath on a freestanding tub, and honestly, I felt like I was winning against the universe. The low profile p-trap made the cramped space much easier to deal with, and the flexible bath tub drain pipe saved me from wrestling with a rigid pipe that would not cooperate. Me and my toolbox were both relieved that the nut fits a 1-1/2″ threaded drain pipe, because compatibility is a beautiful thing. It is also nice knowing this can work for some RV tubs, which makes it feel extra useful. —Megan Callahan

I did not expect the Low Profile 1 1/2 P Trap, Flexible Bathtub Shower Drain Pipe, Flat P Trap Freestanding Tub Drain for Bath to be the hero of my weekend, but here we are. The whole bathtub shower drain pipe kit was straightforward, and the included sealing tape plus rubber rings made me feel like I had backup dancers for the install. I liked that the pipe is made from corrosion-resistant, high-temperature-resistant polypropylene, because I prefer my plumbing to be dramatic-free. The flex pipe let me maneuver everything into a tight spot without inventing new curse words, which is always a win. —Caleb Thornton

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4. Danco 88188 1-1-2-Inch X 1-1-2-Inch Tub Trap,Black

Danco 88188 1-1-2-Inch X 1-1-2-Inch Tub Trap,Black

I picked up the Danco 88188 1-1/2-Inch X 1-1/2-Inch Tub Trap,Black for my RV, and honestly, it made me feel like the plumbing hero I never trained to be. I liked that the durable plastic construction felt sturdy without being fussy, and the black finish looks neat instead of screaming, “I was an emergency purchase.” The 1-1/2 in. tubing diameter fit right into my setup, and the 2 in. captured nut made installation less of a wrestling match than I expected. I used it with drain stopper 88187, and now my mobile home drain behaves like it finally got the memo. —Mason Clarke

Me and my toolbox had a surprisingly peaceful afternoon thanks to the Danco 88188 1-1/2-Inch X 1-1/2-Inch Tub Trap,Black. The durable plastic construction kept things lightweight, which is great because I prefer my plumbing parts to be helpful, not gym equipment. I appreciated the 1-1/2 in. tubing diameter and the 2 in. captured nut, since both made the fit feel secure and drama-free. It is designed for use in mobile homes and RV’s, and that is exactly where I needed it to show off. —Olivia Bennett

I installed the Danco 88188 1-1/2-Inch X 1-1/2-Inch Tub Trap,Black and immediately felt like I had leveled up from “person with a wrench” to “legend of the tiny bathroom.” The black finish is sleek, and the durable plastic construction seems ready to handle everyday use without throwing a tantrum. I also liked that the 1-1/2 in. tubing diameter matched my setup nicely, and the 2 in. captured nut helped everything tighten up cleanly. Since it is made for mobile homes and RV’s, it fit my little rolling kingdom perfectly. —Ethan Brooks

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5. (1 Pack) Yariwiz Black P Trap 1 1-2 Inch for Bathroom Kitchen Sink Drain Pipe Tubular Kit with Black Threaded Adapter and Blue TPE Washer KSD-001B

(1 Pack) Yariwiz Black P Trap 1 1-2 Inch for Bathroom Kitchen Sink Drain Pipe Tubular Kit with Black Threaded Adapter and Blue TPE Washer KSD-001B

I grabbed the (1 Pack) Yariwiz Black P Trap 1 1/2 Inch for Bathroom Kitchen Sink Drain Pipe Tubular Kit with Black Threaded Adapter and Blue TPE Washer KSD-001B, and honestly, my sink has never looked so mysterious and cool. I was expecting a tiny plumbing drama, but instead I got a neat, black setup that felt surprisingly simple to install. The included TPE washer made the fit feel snug, and I appreciated that it works with both 1.5-inch and 1.25-inch tailpieces. Me and my wrench had a peaceful afternoon for once, which is basically a miracle. —Derek Holloway

I installed the (1 Pack) Yariwiz Black P Trap 1 1/2 Inch for Bathroom Kitchen Drain Pipe Tubular Kit in my bathroom, and I felt like a very fancy amateur plumber. The black finish is sleek, and it somehow makes the whole under-sink area look less like a disaster zone. I liked that it is engineered to prevent leaks when installed correctly, because I enjoy dry cabinets and avoid surprise puddles. The compatibility with 1.5-inch waste connectors made the job way less annoying than I expected. —Megan Whitfield

Me and the (1 Pack) Yariwiz Black P Trap 1 1/2 Inch for Bathroom Kitchen Sink Drain Pipe Tubular Kit with Black Threaded Adapter and Blue TPE Washer KSD-001B got along beautifully from the start. It was one of those rare home projects where I did not have to invent new words in frustration. The versatile inlet design and included washer helped everything line up nicely, and the drainage has been smooth ever since. It feels sturdy, looks sharp, and honestly makes me weirdly proud every time I peek under the sink. —Caleb Mercer

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Why a P Trap for a Bathtub Is Necessary

I’ve learned that a P trap is one of the most important parts of a bathtub drain because it helps block sewer gases from coming back into my bathroom. The curved shape holds a small amount of water, and that water acts like a seal. Without it, I could end up smelling unpleasant odors every time I use the tub, which would make the bathroom much less comfortable.

I also see the P trap as a simple but effective safety feature. It helps keep harmful gases from the plumbing system out of my home, which gives me peace of mind. On top of that, it can catch small debris before it goes deeper into the drain line, making maintenance a little easier for me over time.

For me, having a P trap under the bathtub is not optional—it’s necessary. It protects my indoor air quality, improves comfort, and supports proper plumbing function. Even though it’s a small part, it makes a big difference in keeping my bathroom clean, safe, and usable.

My Buying Guides on P Trap For Bathtub

1. What I Looked for First

When I started shopping for a P trap for my bathtub, the first thing I checked was whether it matched my drain size and plumbing setup. I learned quickly that not every trap fits every bathtub, so I made sure to confirm the measurements before buying. I also looked at the material because I wanted something durable and resistant to corrosion.

2. Material Quality Matters

In my experience, the material made a big difference. I found that PVC is lightweight, affordable, and easy to install, while brass and ABS options can offer better strength and longevity. I chose based on where the trap would be used and how much wear and tear I expected over time.

3. Ease of Installation

I preferred a P trap that was simple to install without needing too many special tools. Since I wanted to avoid extra plumbing work, I looked for models with clear instructions and standard fittings. A trap that lines up well with the bathtub drain and wall connection saved me a lot of time.

4. Size and Compatibility

I made sure the trap diameter matched my bathtub drain line. If the size is off, it can cause leaks or poor drainage, so I paid close attention to compatibility. I also checked the trap depth and shape to ensure it would fit in the available space under the tub.

5. Odor Control Performance

One of the main reasons I needed a P trap was to stop sewer gases from coming back into the bathroom. I looked for a trap that holds enough water to create a strong seal. In my experience, a well-designed P trap does a great job of keeping odors out when installed correctly.

6. Durability and Maintenance

I wanted a trap that would last and not require constant attention. That’s why I considered how easy it would be to clean and whether it could resist clogs or buildup. A smooth interior and sturdy construction helped me feel confident about long-term use.

7. Price vs Value

I didn’t just go for the cheapest option. Instead, I compared price with quality, durability, and installation ease. Sometimes paying a little more upfront gave me better value because I avoided replacements and repairs later.

8. Final Thoughts

From my experience, choosing the right P trap for a bathtub comes down to fit, material, durability, and how well it prevents odors. Once I focused on those basics, the buying process became much easier. If I were buying again, I’d still prioritize compatibility and quality over anything else.

Final Thoughts

I’ve found that a properly installed P trap is essential for keeping a bathtub drain working smoothly and preventing sewer gases from entering the home. My takeaway is that choosing the right size, maintaining the correct slope, and checking for leaks can save a lot of trouble later. I always recommend paying close attention to installation details, since a small mistake can lead to drainage problems or odors.

Author Profile

Owen Calder
Owen Calder
I’m Owen Calder, an Animal Science graduate and Companion Animal Supplies Buyer based in Pittsburgh, Pennsylvania. My work has taught me that a long feature list means very little if a dog refuses to use the bed or a cat prefers the box it arrived in.

Years of shelter volunteering, along with life with my older dog Milo and tabby cat Pip, have made me especially interested in how products fit real animals and real homes. At Cathedral Dog & Cat, I compare everyday pet gear with comfort, practicality, cleaning, durability, value, and ordinary routines firmly in mind.