3/8-inch pipe fittings

A reminder of the different types of plumbing fitting:

• M+: a "barb" fitting which is designed to slide inside a pipe. This type of fitting, smooth or ribbed, is very useful if you cannot glue a pipe into a female fitting, and works best with small pipes (especially 1 inch and less) from the same manufacturer as the fitting.
• F: a female or "socket" opening, into which you can glue either a pipe or a male fitting.