Northern California's Trusted Source for Backflow Prevention Parts & Equipment

Authorized dealer for Watts, Febco, Wilkins, Apollo, Ames & Deringer — plus Sub Zero Covers freeze bags. Fast shipping from Rocklin, CA.

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Why Contractors Trust The Backflow Depot

Counties Served

16+

SKUs In Stock

1,000+

In-Stock Orders Ship

Same or Next Day

Freeze Bags

Made in USA

Find Parts for Your Device

Tap the brand, size and model on the device tag. We'll take you to every part in our store that fits.

Repair parts by model

Backflow Parts & Equipment

From repair kits and individual components to freeze bags and test equipment — we stock everything backflow professionals need.

Online & In-Store

Freeze Bags

Authorized dealer for Sub Zero Covers freeze bags — made in the USA with premium materials. Standard sizes in stock, custom sizes available to order.

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Online & In-Store

Repair Kits

Complete backflow repair kits for all major manufacturers. Watts, Febco, Wilkins, Apollo, Ames, and Deringer.

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Online & In-Store

Parts & Components

Individual checks, seats, springs, o-rings, and gaskets. Everything you need to rebuild any backflow assembly.

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Online & In-Store

Test Equipment

Backflow test kits, gauges, and accessories from trusted manufacturers. Keep your certifications current.

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Online & In-Store

Relief Valves

Pressure relief valves and components for reduced pressure zone assemblies and related applications.

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Online & In-Store

Check Valves & Seats

Replacement check valves, rubber kits, and seat assemblies for double check and RPZ backflow preventers.

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Online & In-Store

Accessories & Tools

Specialty tools, lubricants, fittings, and accessories for backflow installation, testing, and repair.

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Online & In-Store

Cages & Enclosures

Protective enclosures, security cages, and covers that shield backflow assemblies from vandalism, weather, and freezing.

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What Testers and Plumbers Reorder Most

Kits and parts our customers order most. Prices and stock come straight from our store.

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Green Sub Zero Covers freeze bags installed on backflow preventer assemblies

Authorized Sub Zero Covers Dealer

Freeze Bags — Made in the USA

We're an authorized dealer for Sub Zero Covers — premium, USA-made freeze bags built to withstand the rigors of professional backflow work. Standard sizes are stocked and ready to ship, with custom sizes available to order.

Five standard sizes for 1/2" to 2" assemblies
Custom sizes available to order
Made in the USA with premium materials
Heavy-duty construction for repeated use
Fast shipping on in-stock sizes

Order a standard size

Freeze Bag Sizing Guide

Instant Sizing Tool

Not Sure What Size Freeze Bag You Need?

Take a photo of the tag on your backflow device and we'll match you to the exact freeze bag — no measuring, no guesswork.

1. Photo the Tag

Take a photo of the metal tag on your backflow device

2. We Read It

We identify the manufacturer, model, and size from your photo

3. Get Matched

We send you straight to the right freeze bag — ready to buy

Get The Right Freeze Bag Size

Free to use. Takes 30 seconds. No account needed.

Find Your Freeze Bag

Take a photo of your backflow device tag. We'll identify it and match you to the perfect freeze bag in seconds.

Open Sizing Tool

Shop Our Store

Browse our freeze bags: five standard sizes in stock and ready to ship today, plus custom sizes to order.

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A Rare Find — Devices Up to 12″

Backflow Device Rentals

Assembly out for repair or stuck on backorder? Rent a working backflow preventer from us and keep your water service compliant and running — one of the only rental programs of its kind in Northern California.

2″ to 12″ devices in stock
Hard-to-find sizes, available to rent
Local pickup in Rocklin, CA
No long-term contracts

View Rental Options

Backflow preventer assemblies with a Sub Zero Covers freeze bag

Parts, Sales & Rentals

Based in Rocklin, CA, The Backflow Depot supplies backflow professionals across 16 counties in Northern California — parts, freeze bags, and rental devices, with pickup in Rocklin or shipping to your door.