About Sub Zero Covers
American-made insulated backflow covers.
Sub Zero Coversmakes heavy-duty insulated covers for backflow preventer assemblies. We don't sell fifty different product lines — we make one thing, and we make it in America.
Made in the USA, end to end
Every Sub Zero Cover is cut, sewn, inspected, and packed at our American facility. No offshore fabric, no overseas assembly, no mystery supply chain — a backflow cover built by people who know what a hard winter does to a backflow preventer.
Shipped nationwide
We fulfill orders to every state in the continental U.S., plus Alaska and Canada on request. In-stock backflow covers go out same or next business day, from our warehouse to your shop or jobsite.
Custom fabrication, fast
Odd assembly, retrofit, non-standard install? Send us measurements and we'll fabricate a custom backflow cover in-house — typically 3–5 business days from approved dimensions.
Lockable for added security
Heavy-duty ¼" brass grommets accept a padlock or cable lock — secure the cover to the assembly and deter tampering, theft, and unauthorized access to the backflow preventer.
Our story, in a paragraph
Why a dedicated backflow cover specialist exists.
Backflow preventers are plumbing-code-required on commercial water lines, irrigation systems, fire-protection risers, and an increasing share of residential installs. In cold climates, an unprotected RPZ or DCDA will freeze, crack, and fail — and when it fails, a water main's worth of pressure has a direct line to somebody's building.
For decades, the protection market was a grab-bag of off-the-shelf insulated bags built overseas, sized roughly, shipped from a regional warehouse, and warranty-honored by a reseller three layers away from the factory. Contractors lived with covers that didn't quite fit, closures that blew open in a storm, and lead times that ran out the clock on the first hard freeze.
We built Sub Zero Covers to be the opposite of that. One product category, fabricated in the United States, engineered specifically to fit the backflow preventers plumbing contractors actually install today. Sold direct. Shipped nationwide. Custom sizes fabricated in house in 3–5 business days. Warranty handled by the same people who stitched the cover.
Our goal is simple: be the nation's most-trusted source for insulated backflow covers — and the easiest one to buy from.
Work with us.
Request a custom fabrication or open a distributor account. We're a phone call or email away during U.S. business hours.