The Schrader Tee-coupler attaches directly to the strut valve to inflate or deflate the strut via the built-in core depressor pin. It attaches securely by hand or wrench to the valve threads (.305-32 thread size) and forms a perfect seal at up to 3000 psi. The air line connector is a 1/8" NPT male thread. 1 lbs (0.5Kg) shipping weight.