PT Coupling Special Application Series Aluminum Fitting, Weld Nipple, 2" Hose Shank Butt Weld Adapter for connecting pipes or fittings of different types Fitting connects to hose on one end and butt-end welds to pipe on the other end Aluminum for resistance to corrosion and chemicals Barbed fitting creates a leak-resistant seal on flexible and semi-rigid hose For use with a hose clamp (sold separately)