you cant decrease a pipe diameter you can only increase...
Increase pitch or increade piping diameter
1-1/4" is typically the diameter of a bathroom lavatory drain pipe. 1-1/2" is more commonly the drain pipe size in kitchen sinks.
The diameter of a pipe is its width across an open end of the pipe. The inside diameter is the width measuring on the inside of the pipe; the outside diameter is the width measuring on the outside.______________________________________________________________________________________________________For a pipe of circular cross section, its nominal diameter is the diameter of the cross section.The inner diameter is the measuring on the inside of the pipeThe outside diameter is the measuring on the outside of the pipe.
Radio Shack "drain pipe tracer".
Normally 3" BUT if your using a sewerage ejector you can go with a 2" grinder pump if properly vented
bore of the pipe is the internal diameter of pipe but the nominal diameter of pipe is the dia of a circle which is draw through a point which is situates at exactly half of the thickness of pipe or we can say that (outer dia of pipe- thickness of pipe )=nominal bore of pipe.
depends on the size of drain piping. Most toilet either have a 3" or 4" drain. The size hole needed would be larger than the outside diameter of the piping. 3" pipe=4" hole / 4" pipe=5" hole
Yes, a sewage drain pipe can be too large.
Foul Air
A large black pipe, 3-4 inches diameter. Start by looking directly under the toilet -you will see it. It's the biggest pipe under your house.
If you are talking about a roof water drain pipe to sewer it is illegal. If you are talking about a sink drain pipe well that is where they all connect to so yea.