 Lokring patented connectors do not use elastomeric or rubber seals, O-rings, or gaskets.The Lokring patented connectors create their seal by shaping the pipe wall first elastically and then plastically with the connector.The connectors, based on helium testing, have a volatile organic compound emission rate that is no greater than 2.4*10-12 kilograms per hour or 4.6*10-8 pounds per year.