The Hurlcon heater bypass plunger is available for the HX70, WX75, HX120, WX120, HX150, JX130, JX160 range of heaters. These by pass plunger assembly does not come with the bypass disk, this is ordered separately. These heater bypass plungers are specifically for the Hurlcon heater and connects to the in/out let manifold. Order your new Hurlcon heater bypass plunger today.