Bathroom Plumbing 101

Most people don’t understand how the plumbing in their bathroom works. They also don’t recognize how vital plumbing is to the functionality of their bathroom. The Bath Haus is here to make basic bathroom plumbing easy to understand. We’ve identified some of the key bathroom plumbing elements we’d like everyone to have a better understanding of.


The P-Trap gets its name from the shape of its body – it looks like an upside down letter P. This particular kind of pipe is installed underneath the sink in your bathroom and is used to trap debris that has drained from your sink from going deep into your overall plumbing system. The other major function of a P-Trap is to prevent sewer gas from getting into your home. The pipe is able to do this because the P part hangs down and contains water, and gases cannot pass through water. Thus, it protects your home from poisonous and smelly gases. A P-Trap can be made from a wide range of materials – ranging from PVC pipe to steel. You’ll want to make sure to talk to your contractor/service professional about what kind of materials are up to plumbing code for the state you live in – some states are stricter than others.

Shut-off Valve

Shut-Off Valve

Shut-off valves can save you a lot of trouble if you ever run into trouble with flooding or need to shut your water supply off. A shut-off valve is a valve that can be added to the plumbing on your sink/toilets and allows you to shut off the water for your sink/toilet without disrupting the flow of water throughout the rest of your home. These valves are also helpful when there is a flood and you need a quick way to turn you water supply off. Most shut-off valves can be purchased for under $10 and can save you a lot of hassle down the road. Talk to your contractor/service professional about adding shut-off valves to your bathroom plumbing.

Wax Ring

A wax ring is an extremely necessary part of your toilet. The wax ring is located between the bottom of the toilet’s base and the flange attached to the waste line in the floor. The ring creates a strong barrier that keeps sewage from splashing and soaking into the floor. The wax on the ring also creates a waterproof seal and prevents harmful bacteria from growing.

Water Supply Lines

Water Supply Lines

Supply lines are an essential part of your bathroom’s plumbing if you want running water. There are two places you’ll find supply lines in a bathroom. The first place is in your sink’s plumbing, giving you access to warm and cold water. The second place is your toilet, supplying you with potable water. There are different types of braiding available for supply lines. If you have questions about your options, we recommend talking with your contractor/service professional and discussing what they recommend.