Viair 90226 Sealed Pressure Switch 85/105 PSI - Weatherproof Control

In this review of the Viair 90226 sealed pressure switch, the bottom line is simple: it is a practical replacement part for air systems that need a compact, weatherproof pressure cutoff set around 85 PSI on and 105 PSI off. The reviewer finds it best for DIYers and technicians who want a straightforward, sealed switch with DOT approved fittings that connect quickly. While customers praise its ease of installation and sealability, some report mixed long-term lifespan and occasional disagreement about pressure accuracy, which are worth weighing before purchase.

Key Features

• Sealed design: The weatherproof housing helps protect the internal switch from moisture and road grime for reliable outdoor use.
• Preset pressure range: Switches on at 85 PSI and off at 105 PSI, giving a clear control window for most automotive and compressor systems.
• 1/4 in M NPT port: Standard threaded port makes it easy to fit into existing airline plumbing without adapters in many setups.
• DOT approved push-to-connect fittings: Nickel-plated brass fittings allow quick, secure airline connections that save installation time.
• 12 GA lead wires: Heavy gauge leads simplify wiring to pumps, relays, or control circuits and reduce the need for extra connectors.
• Working pressure capability: Rated for up to 200 PSI working pressure, so it handles higher pressure systems within its mechanical limits.

Who It's For

This pressure switch suits automotive owners, trailer or RV technicians, and air compressor users who need a compact, sealed cutoff at the specified 85/105 PSI points. It is particularly useful where weather exposure is a concern and where DOT approved, nickel-plated brass push-to-connect fittings speed installation.

Those who should look elsewhere include buyers who want adjustable cut-in/cut-out setpoints or guaranteed multi-year lifespan without question. A model with user-adjustable pressures or documented long-term durability may be a better fit for heavy commercial use.

Pros & Cons

Pros

• Easy to install with DOT approved push-to-connect fittings that provide good sealability.
• Weatherproof sealed housing and nickel-plated brass materials increase resistance to corrosion and moisture.
• Clear preset operation at 85 PSI on and 105 PSI off makes it straightforward to integrate into air systems.
• 12 GA lead wires simplify wiring into pumps or relays for a neat installation.

Cons

• Some customers report mixed lifespan performance, with a few units failing within months.
• Pressure accuracy received mixed feedback, so it may not be ideal where precise calibration is critical.

Specifications

Brand	VIAIR
Port size	1/4 in M NPT
Cut-in / Cut-out	85 PSI on / 105 PSI off
Lead wires	12 GA
Fitting material	Nickel-plated brass, DOT approved
Working pressure	0-200 PSI
Design	Sealed / weatherproof

Our Verdict

The Viair 90226 sealed pressure switch is a good value for DIYers and technicians needing a simple, weather-resistant pressure cutoff at 85/105 PSI with DOT approved push-to-connect fittings. It stands out for ease of installation and material quality, but buyers who require adjustable setpoints or guaranteed long-term lifespan should consider other options.

Frequently Asked Questions

Is the switch suitable for outdoor use?
The sealed housing and weatherproof connections make it suitable for outdoor and exposed installations.

What size fittings and wiring are used?
It uses a 1/4 in M NPT port, DOT approved nickel-plated brass push-to-connect fittings, and 12 GA lead wires.

Can the pressure setpoints be adjusted?
No, the unit is preset to 85 PSI on and 105 PSI off and does not provide user adjustment.