The 1720 series replacement magnet kit is used with 1710 series bodies in ts automatic safety valve applications. All models have flow interruption so that no gas can flow to the main burner while the reset button is depressed. 1720 series kits are designed to replace many individual ts magnet types. Each magnet head kit is tapped for 1/8" pipe with fittings to adapt to 3/16" and 1/4" compression tubing. Also included: spring and diaphragm components, gasket and assembly screws. Note: the 1720-801 should not be used to replace 1720-802 or vice-versa.