Amazon.com: ZXMJYHK Quick Connect Push-in Connection Water Pipe Fitti 2Pcs 6-19mm Brass Equal Barbed Straight Hose Joiner Connector Air Fuel Water Pipe Gas Tubing Pneumatic Gas Reducing Fittings (Color : 8mm) :
Amazon.com: 2Pcs 6mm-19mm Brass Straight Hose Joiner Barbed Connector Air Fuel Water Pipe Gas Tubing Pneumatic Gas Pipe Reducing Fittings DUO ER (Color : 12mm) : Industrial & Scientific