This milky white O-ring, sometimes called a 10,000 psi O-ring, is made of Polyurethane. Available in three sizes for SCUBA regulator-to-valve sealing
Polyurethane O-rings
Size -015 9/16 Inside Diameter 11/16 Outside Diameter 1/16 Cross Section
Captain O-Ring Polyurethane O-Ring, -015 90A Durometer, Round, Translucent (25 Pack)
Urethane O-Rings Global O-Ring and Seal
Polyurethane O-Ring, White, Qty of Five
Made of translucent polyurethane for use with a variety of chemicals and applications Durometer (hardness) of 90A for resistance to penetration Round
006 Polyurethane O-Ring, 90A Durometer, Round, Translucent, 1/8 ID, 1/4 OD, 1/16 Width (Pack of 25)
MOR-7X1.5 - Hercules for o-rings, hydraulic seals, cylinders
Captain O-Ring Polyurethane O-Ring, -015 90A Durometer, Round
RTU37-5.00-62 Hallite 605 Rod Seal
DANCO Large O-Ring Assortment (45-Piece) 10825 - The Home Depot
FX T12 400 O-Ring Kit / Tornado 5 / R&S 1.5-18TFX / Individually
Polyurethane O Ring manufacturer, Polyurethane O Ring supplier-TPUCO
RTU37-5.00-62 Hallite 605 Rod Seal