LMI Milton Roy LMI Milton Roy 0408-0073-221 Spiral Backup Ring, PTFE - RR21020 NSN 5330-00-341-9914. In order to guarantee a leak-free seal, new o-rings and spiral back-up rings should be applied every time the check valves are disassembled. MSRP: Was: Now: $2.87 Add to Cart
