Nylon Plastic Pneumatic Push Fit Fittings Hose Tube Clamps Connector 4mm to 16mm | eBay
Everbilt 1/2 in. Barb x 3/8 in. MIP Nylon Adapter Fitting 800219 - The Home Depot
Midland Metal Mfg. 31068 3/4mgh X 1/2fip White Nylon Adpt, Plastic Fittings, Plastic Garden Hose Fittings, Male Garden Hose X Female Pipe | Blackhawk Supply