Aircraft Aviation Tools SCHRADER High Pressure Struct No Air Loss Coupler 556,Couplings to fill shocks Material: steel 1: Schrader 556 High Pressure Strut Coupler - connector: 1/8" NPT Male or JIC 37° 7/16-20 UNF male Working Pressure: 3,000 PSI 2:The Schrader 556 is designed to inflate and deflate the struts on your aircraft. 3: This high pressure Schrader strut coupler attaches to the strut valve directly via its built-in core depressor pin. Attach the Schrader valve coupler to the valve threads by hand or with a wrench to form a perfect seal at up to 3,000 psi. 4: This product features easy installation and simple use, ideal for handymen of all skill levels. 5:The sturdy high pressure Schrader valve includes a copper sealing washer for fast installation. Sealing washers may need to be replaced after multiple uses to ensure proper sealing on valve mouth.