[Application] Air flow control valve is widely used in pneumatic piping, suitable to use with polyethylene, nylon and PU pipes Air Valve Fittings at ia Rooke blog [Size] 5 Tube ODs optional, 4mm/6mm/8mm/10mm/12mm. Metalwork Plastic Push To Connect Straight Union Tube Fitting 8mm Od X 8mm Od Straight Pneumatic Connector Pack Of 10 Pneumatic Air Valve 5Pcs Air Flow Control Valve, 6mm OD In-Line Speed Controller Union Straight W Quick Connect Speed Controller Inside tooth ensures tight connection and will not be easily disconnected Free delivery and returns on all eligible orders. Shop Bwintech 5 Pcs 6mm Tube OD Air Flow Control Valve,Union Pneumatic Speed Control Flow Controller PSA-06 Straight Union Push to Connect Tube Fitting Regulator Valve [Strong Practicality] Practical fitting for adjusting flew air supply to change driving speed for air cylinder or other operating elements Suitable for use on PU and Nylon tubes