Excellent Tear and Abrasion Resistant 90 Shore Polyurethane PU O Ring - China PU O-Ring, Polyurethane O-Ring | Made-in-China.com
Polyurethane O-rings
Tebru Paintball Regulator O-rings,10pcs 13.8*1.9mm High Strength Polyurethane O-rings for Paintball Gun CO2 Air Tank, Polyurethane Regulator O-rings - Walmart.com
Amazon.com : 100 Polyurethane CO2 / HPA Tank O-Rings (90 Durometer) [RED] - Replacement Urethane orings for Paintball co2 / high Pressure air Tanks : Paintball Gun Replacement Parts : Sports & Outdoors