PT Coupling PTCN Series Aluminum Fitting, Combination Nipple, 1" Hose Shank x NPT Male 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 Aluminum for resistance to corrosion and chemicals 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) Combination nipple for low-pressure discharge or suction service