Thogus Polyethylene Tube Fitting, Adapter, Black, 3/4" NPT Male x Barbed (Pack of 10) Adapter for connecting pipes or fittings of different types Fitting connects to hose on one end and has an NPT male connector on the other Polyethylene is chemically inert, resists cracking, and is a barrier to gases, vapors, and moisture Barbed fitting creates a tight seal on flexible and semi-rigid hose when used with a hose clamp or crimp sleeve or ferrule (sold separately) Meets standards set by NSF International and RoHS for health and safety