304 Stainless Steel Pipe Fittings 1/2"Male/Female Home Straight/Elbow/3-way/4-way Water Pipe Connect Adapter Accessories - AliExpress
Amazon.com: Horiznext NPT 1" male thread to 1 inch O.D. barb stainless steel pipe fitting, for connecting 1 inch I.D. air hose tubing, pack of 2 pcs : Industrial & Scientific