Working on aircraft struts or high-performance shocks? This Schrader 556 coupler is the pro tool you need. It’s a steel, no-air-loss coupler that screws directly onto strut valves (thread is JIC 37° 7/16-20 UNF male) and seals tight up to 3,000 PSI. That means you can inflate or deflate struts without losing pressure – super handy for maintenance and adjustments. It has a built-in core depressor pin, so it opens the valve as you connect it. The kit includes a copper sealing washer for a perfect seal (replace it now and then for best results). Whether you’re in a hangar or a garage, this coupler makes filling shocks with nitrogen or checking gas pressure a whole lot easier. It’s simple, sturdy, and does one job really well.
