Free shipping on orders $149 up. exclusions apply

Backflow Preventer 3/4" FHT x 3/4" MHT

Backflow Preventer 3/4 in.  FHT x  3/4 in.  MHT
In Stock

The 3/4" FHT plastic back-flow preventer (anti-siphon valve) from Hendrickson Bros. is an effective and economical way to eliminate the risk of back-flow contamination from an outdoor hose bib (faucet) or other water outlet with hose threads. Constructed of high-strength ABS plastic the back-flow preventer is made of corrosion resistant material with outstanding reliability and long life. The devises are laboratory tested and industry approved since 1984.

Part #: A015
$2.87 ea.
  ( 4 ratings/reviews )

The 3/4" plastic back-flow preventer (anti-siphon valve) from Hendrickson available in 3/4" with female hose thread or pipe thread. The back-flow device is installed at the beginning of a drip irrigation system and is used to prevent water from back siphoning into the water supply line. The back-flow device should always be used when applying fertilizer and when applying fertilizer the back-flow device should be the first item installed after the faucet. Install it with a pressure regulator with hose or pipe thread.

Important: This type of back-flow device (vacuum breaker) cannot be used under continuous pressure.
Codes do not permit the use of this device under continuous pressure as the back-flow device can stop functioning in emergency conditions. If used under constant pressure, the back-flow device can crack and fail due to a pressure surge when downstream valves close. Some municipalities or local water districts require the use of back-flow device/atmospheric vacuum breakers. Make sure to check your local city code to see if you need to install this device.

By: dunecrane, 05/19/12

These came with the controllers I ordered, and lasted almost all of one season. I upgraded to the heavier duty model (AO32).

By: domerese, 03/07/11

first year of use this began leaking in the first few months on two of my lines out of four

By: kjkessler, 09/09/08

Without a doubt, this backflow preventer is the weakest link in my drip system. Small cracks appear within weeks, which cause my system to leak like crazy. I've changed this model out three or four times now, making adjustments along the way to alleviate excess pressure or strain, and nothing works. I'm now going to try the heavy duty model. Save yourself some money and aggravation and avoid this product.

By: rsolem, 08/04/08

I purchased 2 of these backflow preventers and both of them developed small cracks that rendered them unusable. They were only hand tightened and shouldn't have cracked. I think that it could have been the weight of the water filter assembly (F065) that may have contributed to this.

  • Available: 3/4" FHT x MHT , 3/4" FNPT x MNPT
  • Color: Black
  • Materials: High-strength ABS
  • Maximum pressure: 100 PSI
  • Maximum working temperature: 130 degree F
  • Recommended flow rate: up to 8 GPM
  • Available size: 3/4"
  • Fits all standard faucet or pipe thread
  • High-strength ABS construction for durability
  • Non corrosive materials