5CP oil fill cap w/o o-ring.

Chemical selector valve has 3-way setting: off, prime, and chemical. Fits most Prochem, BLUEline, HydraMaster and Sapphire Scientific truck mount units.

This 1/8" female pipe thread chemical metering valve will fit most Prochem, BLUEline, Sapphire Scientific and HydraMaster units.

HydraMaster temperature bypass solenoid.

The MAC vacuum control solenoids work in conjunction with the temperature controller to operate the exhaust diverter actuator. When not functioning properly the actuator won't open and the unit will often under perform in heating. There are two solenoids employed one as a primary and one as a secondary, it's recommended to change both at the same time.