Dixon Valve & Coupling STC20 Plated Steel Hose Fitting, King Combination Nipple Threaded end with Knurled Wrench Grip, 1-1/2" NPT Male x 1-1/2" Hose ID Barbed: Amazon.com: Industrial & Scientific
Dixon Hose Fittings - Mega Depot
Dixon Valve & Coupling - 1/2" NPT, Universal Hose Coupling with Male NPT Ends - 48440598 - MSC Industrial Supply