OMS delrin replacement knob fits all OMS Scuba Valves Technical Divers never want to be caught without spares available when on site for a Deep, Cave or Wreck Penetration Dive. The best technical divers are always ready for whatever may be needed with a complete Save-A-Dive Kit. Made of durable corrosion resistant Delrin Plastic these OMS replacement knob fits all OMS Scuba Valves