This Hydro Quip 22-C73-040-0G03 heater assembly has a pressure switch inside the black box.
The wires outside the box have a molded 6-pin connector and a molded 3-pin connector.
The Hydro-Quip 22-C73-040-0G03 flo-thru heater assembly has the following features and specifications.
Series: VersiHeat, MSPA (but not limited to, unless specified otherwise above).
Manifold Length: 13"
Manifold Diameter: 2"
Stainless Steel: Yes
Heating Element Included: Yes
Kilowatt Rating: 5.5KW / 1.375KW
Voltage Rating: 240V / 120V
Temperature Sensor Included: No
Hi-Limit Sensor Included: No
Pressure Switch Included (A.K.A. Flow Switch): Yes
Number of Threaded Taps: 1
Threaded Tap Location(s): Pressure switch tap Inside black box.