PLUMBING DRAINS AND TRAPS

Friday, April 10, 2020

Here’s links to a collection of our blog posts about PLUMBING DRAINS AND TRAPS:

 Why can't a sanitary tee be used for a horizontal-to-horizontal drain pipe connection? 

 Is a washing machine drain hose required to be secured at the standpipe?

  Why is it a problem when a trap under a sink is installed backwards? 

 What are the code requirements for plumbing vent terminations?

 What are the code requirements for layout of drain piping under sinks?

 What are the building code requirements for gray water reuse in Florida?

 What causes a gurgling sound when a bathtub or sink drains? 

 What is the difference between a vent stack and a stack vent?

 What is a "combination waste and vent" in a plumbing system? 

• Why is garbage disposal not allowed at a combination waste and vent (CW&V) under a sink?

 What is a building trap?  

 What is an indirect waste receptor? 

 What is the difference between water pipe and sewage (waste) pipe? 

 How can I tell if a house is connected to a septic tank system or sewer?

• What type of water supply and drain (DWV) pipes were commonly used in the 2000s? 

 What type water supply and drain (DWV) pipes were commonly used for 1990s residential plumbing?

What type water supply and drain (DWV) pipes were commonly used for 1980s residential plumbing?

 What type water supply and drain (DWV) pipes were commonly used for 1970s residential plumbing?  

 What type water supply and drain (DWV) pipes were commonly used for 1960s residential plumbing? 

 What type water supply and drain (DWV) pipes were commonly used for 1950s residential plumbing?

Should I seal the washing machine drain hose to the standpipe?

  Why is the European-style bottle trap not approved by the plumbing codes in the U.S.? 

 What is an auto vent, air admittance valve, or check vent?

 Can I make a trap under the sink from straight pipe and 90º elbows?  

 If all the plumbing drains have water in them and you can still smell sewer gas, what's causing the problem?  

 Why is there a flexible accordion pipe under the sink? 

 How do I get rid of the sewer gas smell in my house?  

 What are the pipes on my roof? 

 What is a "cross connection" in a home's plumbing system?

 What is an "S-Trap" under my sink? Why is it a problem? 

 What is a P-trap?

 What is the difference between gray water and black water in the plumbing code? 

Is a sink required to have a drain stopper? 

• Can a laundry sink drain be installed without a trap under it? 

• What is a drum trap at a plumbing drain?

• Can a dishwasher drain hose be connected after the sink trap (to the trap arm)? 


How far away from the sink can I install a dishwasher? 

What is a "high drain loop" or "air gap" in a dishwasher drain hose?

• What is the minimum and maximum distance a P-trap can be below a sink? 

• Is an air admittance valve (AAV) legal by code? 

• What is a double trap in plumbing? 

• Can two sinks share a trap? 

• Does a home inspector check sewer lines underground? 

• What types of plumbing traps are illegal by code? 

What is bell trap at a plumbing drain?

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