MMR Inline Thermostat Housing/Bypass Line delete with 1/2 NPT Port Can be placed in upper or lower radiator hose, great for removing complicated and bulky lower radiator hoses . Perfect for removing factory bypass lines or to add one. The port can be plugged or also be used for a coolant temp sensor if needed using a 1/2npt to 3/8npt reducer. * For 1.5" Hose (in and out) or -16AN (in and out) OR COMBINATION * Can be used to Adapt -16AN to 1.5" Hose * Leakfree O-ring design * 100% Made in USA BY MMR * Accepts traditional Thermostats/gaskets (not included) (Small block Chevy Thermostat & Gates 33616 rubber gasket) * If you do not wish to use the port, it can be simply plugged using a 1/2 NPT plug fitting. * Part easily unbolts for Thermostat installation or replacement