Manufactured In-House
Every freeze bag is cut, sewn, and assembled at our Rocklin, CA facility. No overseas middlemen, no mystery factories. We control quality from raw material to finished product.
Manufactured In-House • Made in the USA
Backflow Freeze Bags & Insulation Blankets
Protect your backflow preventer from freeze damage with heavy-duty insulated freeze bags manufactured right here in Rocklin, California. Over 50 sizes from XS to XXXXL — because one size never fits all.
50+ Sizes In StockMade in Rocklin, CAFast Nationwide Shipping
Why Choose Our Backflow Freeze Bags
We do not just sell freeze protection — we manufacture it. Every backflow insulation blanket is built to our specifications at our own facility.
Heavy-Duty Freeze Protection
Our backflow insulation blankets use high-density insulation with UV-resistant outer shells to protect your backflow preventer from freezing temperatures season after season.
50+ Sizes Available
From compact 3/4-inch residential devices to massive 10-inch industrial assemblies, we stock over 50 freeze bag variants so you always get the right fit.
Made in the USA
Proudly made in Rocklin, California. Our freeze bags support American manufacturing and meet the quality standards that imported products simply cannot match.
Fast Shipping & Local Pickup
Order online and get fast shipping nationwide, or pick up same-day from our Rocklin, CA warehouse. We keep all sizes in stock and ready to ship.
Easy Installation
No tools required. Our backflow freeze bags slip on in under two minutes with secure strap closures. Quick to install, quick to remove for testing season.
Freeze Bag Sizes — XS to XXXXL
Use the size guide below to find what fits your device, then head to our store to order.
Shop All Sizes on Our StoreXS
Fits 3/4" devices
Small compact assemblies
S
Fits 3/4" - 1" devices
Standard residential
M
Fits 1" - 1-1/2" devices
Larger residential assemblies
L
Fits 1-1/2" - 2" devices
Small commercial assemblies
XL
Fits 2" - 2-1/2" devices
Standard commercial assemblies
XXL
Fits 3" - 4" devices
Large commercial assemblies
XXXL
Fits 4" - 6" devices
Industrial assemblies
XXXXL
Fits 6" - 10" devices
Large industrial assemblies
Shop All Sizes on Our Store
Don't see your size? Contact us for a custom quote.
Made In-House, Made in the USA
Unlike most suppliers who resell imported freeze bags, The Backflow Depot manufactures every backflow freeze protection bag right here in Rocklin, California. Our team cuts, sews, and assembles each insulation blanket by hand, so we can guarantee the quality and consistency that your backflow preventer deserves.
We started making our own freeze bags because we were tired of the poor quality coming from overseas. Thin insulation, weak stitching, and one-size-fits-none designs were the norm. So we built a better product ourselves — and with over 50 size variants, we can fit virtually any backflow assembly on the market.
When you buy a freeze bag from The Backflow Depot, you are buying directly from the manufacturer. No middlemen, no markups, no compromises on quality.
How to Size Your Backflow Freeze Bag
Getting the right fit is critical for proper freeze protection. Use our free sizing tool — it takes 30 seconds.
Snap a Photo. Get Matched Instantly.
Take a picture of the metal tag on your backflow device. Our tool reads the manufacturer, model, and size — then sends you straight to the right freeze bag, ready to buy.
Get The Right Freeze Bag SizeFree. No account needed. Works on any phone.
Or size it manually
1
Measure Your Device
Measure the overall length, width, and height of your backflow preventer assembly, including valves, test cocks, and any protruding fittings.
2
Check the Pipe Size
Note the pipe diameter of your backflow preventer (e.g., 3/4", 1", 2", 4"). This is the primary factor in selecting the correct freeze bag size.
3
Match to Our Size Chart
Compare your measurements to our size grid below. If you fall between two sizes, choose the next size up to ensure full coverage and proper insulation.
4
Need Help? Call Us
Not sure which size fits? Send us a photo of your backflow assembly at sales@thebackflowdepot.com or call 916-251-7071. We will size it for you for free.
Frequently Asked Questions About Backflow Freeze Bags
Everything you need to know about backflow freeze protection, sizing, installation, and ordering.
How do I choose the right freeze bag size for my backflow preventer?
Measure the overall length, width, and height of your backflow preventer assembly including any valves and test cocks. Match those measurements to our size chart, which ranges from XS (for compact 3/4-inch devices) up to XXXXL (for large 10-inch assemblies). If you are between sizes, choose the next size up for a proper fit. You can also call us at 916-251-7071 and we will help you find the right size.
Will your freeze bags fit any brand of backflow preventer?
Yes. Our backflow freeze bags are designed to fit all major backflow preventer brands including Watts, Wilkins/Zurn, Febco, Ames, and Apollo. With over 50 size variants, we have a freeze bag for virtually every residential, commercial, and industrial backflow device on the market.
How do I install a backflow freeze bag?
Installation is simple and requires no tools. Slip the insulated freeze bag over your backflow preventer assembly, secure the built-in straps or drawstring closure around the piping, and make sure all exposed components are covered. The entire process takes about two minutes. Remove the bag when temperatures rise to allow access for testing.
How long do your backflow freeze bags last?
Our freeze bags are built to last multiple seasons. They are manufactured with heavy-duty, UV-resistant outer shells and high-density insulation that maintains its R-value year after year. With proper storage during warm months, most customers get 5 to 10 years of reliable freeze protection from a single bag.
Do you offer custom-sized freeze bags for unusual backflow installations?
Absolutely. Because we manufacture all of our freeze bags in-house at our Rocklin, CA facility, we can produce custom-sized insulation blankets for non-standard backflow preventer installations. Contact us at sales@thebackflowdepot.com or call 916-251-7071 to discuss your custom freeze bag needs.
Protect Your Backflow Preventer Before the Next Freeze
Do not wait until temperatures drop. Order your backflow freeze bag today from the manufacturer — 50+ sizes in stock, made in the USA, and ready to ship.