Left and right nipple and coupling / union / TP coupling
View page
threaded pipe use an extractor
View page
A coupling
View page
A coupling is a threaded or soldered solid fitting, a union is a
fitting that joins two pipes and can be taken apart with
wrenches.
View page
A coupling has internal threads and a sleeve is used to protect
piping from coming in contact with cement of from being crushed by
structual weight. A sleeve is used when pipe is passing through
walls and foundations and through floors