Strain relief cord connectors – pg- .181″- .312″ liquid tight strain relief cord connectors have a unique design that has vibration proof protection (up to 70 psi) and an optimum seal std mpt thread & flex-type internationally approved: ul #e79903- csa #lr50370-10- vde #57986- sev #100989 std pg thread 6/6 nylon w/ tpe gland. Ul listed under #e-51579- csa #lr-93876. dust protection and resistant to salt water- weak acids- weak alkalis- alcohol- gasoline- oil- grease- and common solvents standard dome nut for strain relief only; or use a flex nut type which includes the strain relief and helps prevent cable kinking working temperature: -22