PneumaticPlus SCF-1/4 Air Flow Control Valve with Push-to-Connect Fitting, In-Line Speed Controller Union Straight - 1/4" Tube OD x 1/4" Tube OD Body Style: Speed Controller Union Straight Push-to-connect fittings on the inlet and outlet ports1/4" Tube OD x 1/4" Tube OD Knob for precise manual adjustment of flow rate Applicable Tube: Polyurethane and Nylon, Fluid Type: Air Only In-line air flow control valve for controlling the speed of low-speed pneumatic cylinders