RHEEM Pressure Switch Kit (−0.35″ WC) 42-105601-105

The Rheem Pressure Switch Kit (−0.35″ WC) 42-105601-105 is a genuine OEM pressure switch kit that monitors draft/vent pressure on compatible Rheem and Ruud commercial packaged gas/electric units. Factory-calibrated at −0.35″ WC, it opens the safety circuit if inducer airflow is too low, shutting the system down before an unsafe condition develops. Self-cleaning contacts help the switch stay reliable in dusty rooftop environments, and the kit arrives with silicone tubing, wire leads, and ties so you can replace a failed switch without hunting extra hardware. Using the exact OEM set point keeps lockouts and nuisance trips from a mismatched aftermarket switch off the table.

Dimensions

• Trip setting: −0.35″ WC (SPST)
• Kit weight: approx. 0.31 lb
• Typical package size: approx. 6-1/4″ L × 3-3/8″ W × 2-7/8″ H
• Switch body: compact chassis with barb fitting for 1/8″ ID tubing and quick-connect terminals

Compatibility

• Rheem / Ruud / Protech commercial packaged gas/electric (rooftop) units
• Common series: RKHL-C, RKHL-D, RKKL-B, RKNB, RKNL-B, RKNL-C (also listed on related SKKL-B / SKNL-B models)
• Example models include RKHL-C/D 090–180, RKNL-B/C 085–300, RKKL-B 151/180, and RKNB-A 180
• Kit contents: pressure switch, silicone tube, wire leads, wire ties
• Always confirm against the unit’s model/serial and parts list; pressure-switch set points are not interchangeable across kits (e.g., 42-105601-20, -106, etc.)