Anti siphon valve vs backflow preventer

Anti siphon valve vs backflow preventer

An anti-siphon valve prevents irrigation water from contaminating your household water supply. These are available with or without an outlet union for easier installation and are available in 3/4″ or 1″ sizes. Anti-siphon valves are also available for use with automatic actuators.

Backflow preventers are specifically designed to prevent reverse flow in fire sprinkler systems. It prevents contamination of drinking water by keeping water from flowing backward into a water supply line. These are perfect for industrial settings where chemicals are connected to water lines and municipal water systems. It keeps undesirable liquids and solids from contaminating plumbing.

In this article, we discuss these two kinds of water preventers. We will include their features, pros, cons, and the differences between them. Our article will help you to decide to choose one among them.

What Is An Anti-Siphon Valve?

It comes with a one-way valve that allows water to flow in just one direction.

Many anti-siphon valve models prevent water from potentially overflowing with contaminants from flowing back into the water source, with most using similar controls.

Are anti-siphon valves necessary?

An anti-siphon valve comes with irrigation systems and outdoor faucets to protect municipal drinking water. It allows residual water in the faucet to drain. It also prevents faucet and pipe damage from frozen water in winter.

What is the major difference between a check valve and a backflow preventer?

Backflow preventers are uses in high hazard situations. It protects the potable water with its fail-safe design fully. In contrast, check valves are used in low hazard situations and prevent backward water flow. But it does not have the same fail-safe components.

Are backflow preventers offers durability?

Backflow preventers are extremely durable, and it is made to last. Once installed, it goes fifty-plus years. It can provide the required protection for your water systems.

How much does it require to replace a backflow preventer?

To replace this part, you should require a minimum cost between $80 and $1,150. It includes the parts and a labor fee between $40 and $250.

Where are Backflow Preventers used?

A backflow preventer provides an indomitable line of defense for backflow problems. You can use commercial projects for apartments, condominiums, and fundamentally, all business properties. It is the best choice for the industry standard.

Where are Anti Siphon Valves used?

An anti-siphon valve is a sensible preventer for deployment on your residential irrigation system. These are simple to implement and quite inexpensive.

Anti Siphon Valve Vs Backflow Preventer

An anti-siphon valve is a perfect choice for residential irrigation systems because of economic reasons and simplicity of application.

Backflow preventers are perfect for commercial properties, irrigation systems. You can use it for feeding products like fertilizers to crops, and where it’s impractical to mount anti-siphon valves.

Rain Bird DASASVF075 Professional Grade Anti-Siphon Valve with Flow Control

Rain Bird Anti-Siphon Valve is compatible with all kinds of sprinklers and water systems. It is well known for its quick and easy functionality. This anti-siphon valve supports water flow control and comes with universal functionality. You can use it with all types of sprinklers and timers.

This valve provides maximum efficiency and the highest value for money. It comes with a reverse flow design that increases overall reliability and efficiency.

This item provides an automatic and manual operating system. It has the ability to prevent backflow for sprinkler heads 6 inches or above the sprinkler head. It offers effective control overpressure.

Key Features

  • Endure harsh water environments
  • Expected to last 10 to 20 years
  • Designed for larger residential areas
  • It comes in both flow and non-flow models
  • It comes with a Reverse Flow design


  • Effortless installation
  • Very durable and sturdy
  • Affordable price tag
  • Endure high water pressure


  • Not suitable for freezing temperatures

Mueller/B & K 108-904RP Backflow Preventer-Vacuum Breaker

Mueller/B & K Backflow Preventer works well in a variety of settings. It is the best choice for both outdoor and indoor usage. This item is compatible with any 3/4″ hose thread outlet. It works to prevent back siphoning, especially where there are high hazard possibilities that exist.

This Backflow Preventer comes with a compact and lightweight design. It offers a male hose thread outlet that you can attach to hydrants, valves, and sill cocks.

This item prevents contamination, especially in areas where temperatures do not go below freezing. It includes a manual drain release on its outlet side, which will allow you to drain the valve completely.

It is a perfect choice for you to operate a shared water source and use some water for irrigation purposes. This item is the most budget-friendly option for you.

Key Features

  • Pack of 2
  • Prevents back siphoning of contaminated water
  • Compatible with any 3/4″ hose
  • Minimal issues with water spraying


  • Affordable price tag
  • provide reliable service
  • easy to install
  • Reliable construction


  • It has leaking issues


Both the anti-siphon valve and backflow preventer prevents water from flowing in the wrong direction. Both are essential components of backflow preventers. Among them, we think, Anti-Siphon Valve is the best one to buy.

It comes with a reverse flow design that increases overall reliability and efficiency. It has the ability to prevent backflow for sprinkler heads 6 inches or above the sprinkler head. This valve offers effective control overpressure.