Rainier Precision

About Rainier Precision

Rainier Precision is an Oregon-based American manufacturer with more than six decades of experience in precision plastic injection molding. While the company serves industrial clients across the U.S. and Canada with custom molding services, it is perhaps best known to consumers as the maker of Dri-Z-Air — a trusted line of refillable, non-mechanical moisture absorbers that have become a go-to solution for controlling humidity in enclosed spaces.

The Science Behind Dri-Z-Air

Excess moisture is one of the most overlooked threats to stored equipment, vehicles, and living spaces. Unchecked humidity promotes mold, mildew, musty odors, condensation on windows and walls, and can quietly damage woodwork, fabrics, and mechanical components over time. Rainier Precision's Dri-Z-Air dehumidifiers tackle this problem with a straightforward, chemical-based absorption process: specialty crystals placed in the upper basket gradually draw moisture from the surrounding air, transforming from a solid into a liquid that collects safely in a lower reservoir — no power outlet, no compressor, and no noise required.

Versatile Moisture Control for Any Space

One of the defining strengths of the Dri-Z-Air system is its versatility. Whether you need to protect the interior of a boat during off-season storage, keep an RV or camper dry between trips, freshen a closet, or manage humidity in a garage or storage unit, these units are compact and self-contained enough to work virtually anywhere. The refillable design makes them an economical long-term solution — when the crystals are depleted, simply recharge with a fresh bag of Dri-Z-Air refill crystals and the unit is ready for another season.

Made in the USA

Rainier Precision manufactures Dri-Z-Air products in the United States, drawing on their deep expertise in plastic fabrication to produce durable, well-engineered housings that hold up through repeated use. The Classic Unit and Decorator Unit styles offer options to suit different aesthetic preferences while delivering the same reliable moisture-fighting performance. Both designs are odorless in operation and sized to fit discreetly in tight quarters like lockers, cabinets, and equipment compartments.

Why Dri-Z-Air Belongs in Your Maintenance Toolkit

For boaters, RV enthusiasts, outdoor gear owners, and anyone who stores equipment or vehicles for extended periods, managing ambient moisture is a critical part of preventive maintenance. A single Dri-Z-Air unit is a low-cost, low-effort safeguard that can prevent far more expensive problems down the road — from corroded metal and warped wood to mildewed upholstery and persistent odors. Explore Rainier Precision's full lineup of dehumidifiers and moisture absorbers to find the right unit and refill crystals for your needs.