LTWFITTING Brass Fitting Connector 1/2-Inch Hose Barb x 3/4-Inch NPT Male Fuel Gas Water(Pack of 5): Pipe Fittings: Amazon.com: Industrial & Scientific
H59 Series Pneumatic Push in Quick Touch to Connect Fitting - Male Elbow - 90 Deg Swivel Elbow 10mmTube-1/8''NPT: Amazon.com: Industrial & Scientific
Parker 68P-8-4 Compression Fitting for Thermoplastic and Soft Metal Tubing, Poly-Tite, Tube to Pipe, Brass, Compression and Male Pipe Connector, 1/2" and 1/4": Amazon.com: Industrial & Scientific
Jones Stephens G20-111 3/4-Inch Male Hose Thread X 3/4-Inch Female Pipe - Pipe Fittings - Amazon.com