ANTI-THERMAL SIPHON KIT

ANTI-THERMAL SIPHON KIT, THIS KIT SHOULD BE USED WHEN THE AM30 AIR MODULE IS INSTALLED ABOVE THE HM30 HEAT MODULE, KIT PROHIBITS THE BACKFLOW OF WATER FROM THE AM30 UNIT, INCLUDES:(1)CHECK VALVE, (2)COPPER MALE FITTINGS NPT TO SWEAT, WEIGHT:1LB 6oZ, ORIGIN:USA, IN MANUFACTURER BOX