Check the listing for details. Captain O-Ring Polyurethane Oring, -019 90A Durometer (25 Pack). Condition: New. Listed at 16.29 USD. Captain O-Ring Polyurethane O-Ring, -019 90A Durometer, Round, Translucent (25 pack) Product Features: Size -019 90A Durometer Polyurethane 13/16" Inside Diameter 15/16" Outside Diameter 1/16" Cross Section Translucent polyurethane is compatible with a variety of chemicals for virtually any sealing application. 90A durometer (hardness) for resistance to penetration and tearing. For use in temperature applications between -60 F to 212 F (-51 C to 100 C). Meets Aerospace Standard AS568A. What to expect: This item includes twenty-five (25) o-rings in a resealable zip-top poly bag with "Captain O-Ring" branded packaging. Manufactured and warrantied against defect for one year by Captain O-Ring LLC. "Captain O-Ring" is a registered trademark of Captain O-Ring LLC.