The 10 Best Backflow Preventers

Any drip irrigation system needs the Habitech Adapter Kit (appx. $20). It doesn't just prevent backflow, but also acts as a filter and pressure regulator, so your plants won't be washed away or blasted with silt. It won't waste your water, either, as it's not prone to leaks.

If you have a line in an area where a significant health hazard exists and lead-free pipes are a necessity, the Zurn Wilkins 34-975XL2 (about $269) should be on your short list. It's built in a Wye-pattern that minimizes its lay length, making it easier to fit into your fixtures.

The Watts 63190 (around $36) has a brass body that houses stainless steel internal parts. Beyond that, there's also an integral strainer and dual rubber check valves that seal tightly, ensuring that liquids can definitely only travel in one direction.

Screw the Plumb Craft Waxman 7032000N (appx. $9) onto the end of your garden hose to prevent any mud, dirt, and debris from sneaking back inside your home's water supply. It also functions well when paired with submersible pumps, provided you don't put it in the sump.

The Cash Acme V-101 (appx. $9) can handle temperatures of up to 212° F, enabling you to use it on your spa or hot water heater without fear of it melting on you. It can stand up to high pressures as well, ensuring you won't have to worry about it shaking as it struggles to cope.

The Mueller/B&K 108-904RP (around $11) is designed for permanent installation and can protect your water supply for years to come. If you need to take it off, though, you'll have to cut off the end of the pipe that it's attached to, so be sure you really want it prior to putting it on.

You can access the check and relief valves separately on the Zurn Wilkins 2-975XL2 (about $600), so if anything ever goes wrong, you won't have to curse too much while making repairs. That can save you both time and money, especially if you're having to pay someone else to do it.

If you have a drip irrigation system in the backyard, the Rain Bird HT075BFFS can keep everything clean and flowing freely. It's inexpensive and connects to a male-threaded faucet or hose, so it should be able to fit in with just about anything you have set up.

If you use a hose to irrigate your garden or lawn, the Drip Depot Hendrickson DG41 (around $84) is worthy of your consideration. It's also a smart choice for RV owners, as it can keep your blackwater from mixing with the clear stuff while you're cleaning out the tank.

The Homewerks VAC-BFP-Z4B (around $6) has a break-off screw that allows you to attach it permanently, if so desired. Just don't stand next to the hose when you turn it off, because it releases all the water it's holding back at that time — and it doesn't care if you're in the way.