... , SH3409,HG/T21635,DL/T695,SY/T0510, DIN2617Pipe cap: A type of pipe fitting, usually liquid or gas tight, ... which covers the end of a pipe. A cap is ... other end closed off. If a solvent weld cap is used to provide for a future connection point ... it. In plumbing systems that use threads, the cap has female threads. Industrial caps can be round, square ...