The Safe-T-Link connector also comes standard w free spinning welded 3/4in NPT male fittings on each end. HG-4D-48K-FF Safe-T-Link 48in FreeSpin Quick Disconnect Gas Connector Hose w Elbows Hook up your gas appliances safely and quickly w the T&S HG-4D-48K-FF Safe-T-Link 48in gas connector hose! A 3/4in NPT quick disconnect acts as a shut-off valve by allowing you to cut off the gas flow when the plug and socket are removed from the appliance.. Dipped coatings can seep into the braid and put extra stress on the steel wires shortening the life of your hose.