VIAIR 90145 RV Winterization Kit - Easy RV Water System Protection

In this review of the VIAIR 90145 RV Winterization Kit, the bottom line is straightforward: this kit is for RV owners who use a VIAIR 400P-RV or 450P-RV compressor and want a simple, reliable way to blow out water lines before freezing weather. The kit's single biggest reason to buy is how it pairs a dedicated regulator and a 220 PSI gauge with a 1/4 quick connect coupler so the compressor can clear freshwater lines without risking overpressure. It is a practical, do-it-yourself solution that reduces the risk of costly freeze damage in spring.

Key Features

• Model compatibility: Designed specifically to be used with VIAIR 400P-RV or 450P-RV compressors so users get a proper fit and reliable performance.
• Pressure control: The included regulator lets you limit output pressure, protecting water lines and fittings when blowing out the system.
• Accurate monitoring: A 220 PSI gauge provides a clear, immediate readout to confirm the compressor is operating within safe limits for winterization tasks.
• Quick connection: The 1/4 quick connect coupler and stud (M, NPT) make attaching to the compressor fast and secure for field use while traveling or at the campsite.
• Blow out plug: The dedicated blow out plug threads into the water intake to allow direct removal of water from lines, simplifying the winterization process.

Who It's For

The VIAIR 90145 is best for owners of travel trailers, fifth wheels, and motorhomes who already have a VIAIR 400P-RV or 450P-RV compressor and want a compact kit to winterize freshwater systems themselves. It suits people who tow through seasonal climates, store rigs for winter, or prefer doing preventative maintenance to avoid spring repairs.

Customers who do not own a compatible VIAIR compressor or who need an all-in-one pump replacement should look elsewhere, since this kit is an accessory that depends on the 400P-RV or 450P-RV model to function. It is not a substitute for professional plumbing service when there are preexisting leaks or system damage.

Pros & Cons

Pros

• Effective pressure control via the included regulator helps prevent overpressurizing delicate lines and fittings.
• Easy to assemble and use, with a 1/4 quick connect coupler that speeds hookup during roadside or campsite work.
• High quality components and a clear 220 PSI gauge give confidence in operation and monitoring.
• Blow out plug screws directly into the water intake, making the wet-to-dry transition straightforward.

Cons

• Only compatible with VIAIR 400P-RV and 450P-RV compressors, so it is not universal for all RV compressors.
• The kit assumes basic familiarity with winterization steps; newcomers may need guidance on safe pressures and procedures.

Specifications

Product name	VIAIR 90145 RV Winterization Kit
Compatible compressors	VIAIR 400P-RV or 450P-RV
Coupler type	1/4 quick connect coupler and stud (M, NPT)
Included gauge	220 PSI gauge
Included regulator	Adjustable regulator for pressure control
Included fitting	Blow out plug for water intake

Our Verdict

The VIAIR 90145 RV Winterization Kit is a sensible, well-made accessory for owners of VIAIR 400P-RV or 450P-RV compressors who want to protect freshwater systems over winter. It delivers useful pressure control, a clear gauge, and straightforward hookups that make winterization easier and lower the risk of freeze damage, offering good value for owners already invested in VIAIR RV compressors.

Frequently Asked Questions

Will this kit work with other compressors?
The kit is intended for use with VIAIR 400P-RV or 450P-RV models and may not interface correctly with other compressor designs.

Can the regulator prevent overpressure when blowing out lines?
Yes, the included regulator lets you limit output pressure so the compressor does not push excessive pressure through the freshwater system.

Is the blow out plug easy to install?
Yes, customers report the adapter screws directly into the water intake and makes blowing out lines straightforward when used as directed.