Its not advisable to have a hard 90-degree bend in a horizontal drain line thats buried in a slab or hidden. It is not ideal to have the p-trap below the the exit drain because water gravity has to force the water out instead of it flowing downwards naturally. on the other hand If your p trap is too high (more than 24 inches) you wont get good drainage either as their will be too much velocity that will empty the P Trap rendering it useless and also you wont be able to hookup your garbage disposal. Is there any difference in the type of wiring in common household? If you live in a condo or apartment where the plumbings are connected, its probably best to wait for a plumber to make the necessary repairs. Installing a P-trap is not difficult and doing it yourself could save you $170 or more in labor costs of hiring out. Even your toilet has an internal trap shape to its porcelain configuration that serves exactly the same function. Adjust the length based on the difference between the P-trap and extension. Then divide the trap arms diameter into two, and add half of this diameter to the measured distance for the most accurate measurement. But we will get to that a little later on. How does a contractor determine the water performance rating needed for a sliding glass door? Learn More Here. Double-check the distance from the bottom of the valve to the top of the waste arm to make sure it's at least 4 inches. I guess could even be higher, just lower than the sink. If I have a Zoned HVAC system, should there be more than one filter to change? Consider choosing a PVC P-trap because youll get less plip-plop water sounds than with a brass alternative. That causes the air to travel up as the water flows down, resulting in NO DRAINAGE. Lets dive into P-traps and see what some of the requirements that they come with entail. Check with your local state, city, town code for exact answer. The P-trap needs to be of the correct size for the drain of the fixture. The 10 Most Common Plumbing Mistakes DIYers Make - Family Handyman But essentially anything below already creates its own p-trap- so using another is redundant. The trap is usually attached to the end of the tailpiece, and tailpieces are typically between 6 8 inches long (though Ive seen up to 12). P traps are like the updated version of S traps and eliminate the siphoning problem. P-traps hold water, and that is their entire purpose. The P-trap should be located no more than 24 below the drain. below the drain. P-traps are a lifesaver as the alternative, i.e. Which ever way you chose Just ensure that the P-trap is close to your shower drain as close as possible and also be position in a place where it should be self cleansing so you will have no issues. This height allows for proper functionality and easy repair of the P-trap. Second, a waste arm extension is added to the drain side of the trap. Insert the horizontal trap arm into the wall drain fitting, going as far as it will go. This is the point where the spillover happens when you fill the sink.