Amazon.com: Pipe Fittings - 5pcs 2/4/6mm Soft Hose Fittings Y-Type Tee Connector Aquarium Adapter Fish Tank Air Pump Joint 3 Way Connector (2.4mm(L)) : Pet Supplies
Amazon.com: Metalwork Plastic Push to Connect Straight Union Pipe Tube Reducer Fitting, 6mm OD x 8mm OD, Reducing Coupler Straight Pneumatic Connector (Pack of 10) : Industrial & Scientific
Buy Gubes Pvc Pipe 120mm Conduit Pipe Fittings 6mm from Huai'an Zhili Pipe Industry Technology Co., Ltd., China | Tradewheel.com