42-105601-20 Rheem-Ruud SPSP PRESSURE SWITCH -.45wc 

Replaces: 42-24335-20

Keep your furnace or water heater running safely and reliably with the genuine Rheem‑Ruud SPSP pressure switch, part number 42-105601-20. Designed for precise low‑vacuum sensing, this OEM pressure switch monitors draft and combustion air flow and trips reliably at -0.45 inches water column (in. WC) — the exact performance your Rheem/Ruud appliance expects.

Product highlights

• Part Number: 42-105601-20

• Brand: Rheem / Ruud (OEM)

• Type: Single‑pole single‑throw (SPSP) pressure switch

• Trip Setting: -0.45 in. WC (factory calibrated)

• Application: Draft/pressure sensing for gas furnaces, water heaters, and packaged heating appliances

• Mounting: Compact chassis with standard mounting holes for direct replacement

• Terminals: Quick‑connect spade terminals for fast wiring

• Inlet: Standard vacuum barb for 1/8" ID tubing

Why choose this part

• Exact OEM fit — guaranteed to match factory specifications for Rheem and Ruud models that list this switch, reducing troubleshooting time and fitment issues.

• Reliable safety function — accurate low‑vacuum trip ensures proper venting and safe burner operation.

• Quick install — ready for drop‑in replacement using existing tubing and spade connectors.

• Durable construction — designed for long service life in typical residential HVAC environments.

Typical uses and compatibility

• Replacement pressure switch for Rheem and Ruud gas furnaces, gas-fired water heaters, and certain packaged HVAC units that require a -0.45 in. WC trip point.

• Ideal for service calls, preventative maintenance kits, and OEM repair jobs where restoring factory performance is critical.

Installation notes (technician friendly)

• Always shut off power and gas before servicing combustion controls.

• Verify tubing is clean, flexible, and free of kinks; replace aged vacuum tubing to ensure accurate sensing.

• Confirm spade terminal sizing and torque; ensure solid grounding of the appliance.

• Perform a post‑service functional check: verify the switch opens/closes at the correct vacuum while observing safe combustion and venting behavior.

What’s included

• One (1) genuine Rheem‑Ruud pressure switch, 42-105601-20. Vacuum tubing and connectors not included unless specified.

Warranty & quality

• OEM part backed by Rheem/Ruud quality standards. Check vendor page for warranty details and return policy.