2-Pack Air & Vacuum Relief Valve 3/4 & 1 Inch BS Thread Irrigation

2-Pack Automatic Air & Vacuum Relief Valves — Built for Reliable Water Flow

Keep your drip irrigation system, water tank, or garden water line running smoothly with this set of 2 Automatic Air & Vacuum Relief Valves. Designed with a BS (British Standard) thread connection, these valves automatically release trapped air and prevent vacuum lock — ensuring consistent, uninterrupted water flow throughout your irrigation network.

Constructed from durable PP (polypropylene) plastic, these lightweight yet robust valves are built to withstand pressures up to 850 kPa, making them suitable for a wide range of residential and agricultural water systems. Available in both 3/4 inch and 1 inch male connector sizes to suit various pipe configurations.

Made in Mainland China.

Key Features

• Automatic Operation: Releases trapped air and relieves vacuum conditions automatically — no manual intervention needed
• Dual Size Pack: Includes one 3/4 inch and one 1 inch valve, or a pair of your chosen size, for flexible installation
• BS Thread Standard: Compatible with British Standard male connector fittings for secure, leak-free connections
• High-Pressure Rating: Rated up to 850 kPa, suitable for demanding drip irrigation and water tank systems
• Durable PP Construction: Corrosion-resistant polypropylene material for long-lasting outdoor performance
• Wide Compatibility: Ideal for water tanks, drip irrigation lines, garden water systems, and more
• No Harmful Chemicals: Free from high-concern chemicals for safe use in garden and irrigation applications

Specifications

What Is an Air & Vacuum Relief Valve?

Air and vacuum relief valves are critical components in pressurized water systems. They automatically vent trapped air during filling and prevent vacuum siphoning when the system drains — protecting pipes, emitters, and water tank infrastructure from damage caused by pressure imbalances. Learn more about efficient irrigation design from the EPA WaterSense Irrigation resource.

Great Pairing Products

Complete your garden irrigation setup with these related items from our store:

• 1-Inch Threaded Brass Ball Valve – Water, Gas & Oil Flow Control
• 1-Inch Impact Rocker Sprinkler – Adjustable Rotating Irrigation

Learn more: Valve

Frequently Asked Questions

Q: What size pipes are these air and vacuum relief valves compatible with?

A: These valves are available in 3/4 inch and 1 inch sizes with a BS (British Standard) male thread connection. This pack includes two valves — check your product variant selection for the specific size combination. They are compatible with standard BS-threaded irrigation fittings and water tank connectors.

Q: Where should I install an air and vacuum relief valve in my drip irrigation system?

A: Air and vacuum relief valves are typically installed at the highest point of an irrigation line or water tank outlet where air is most likely to accumulate. This ensures air is expelled efficiently during system pressurisation and vacuum lock is prevented when the system depressurises or drains.

Q: Are these valves suitable for outdoor and agricultural use?

A: Yes. Made from corrosion-resistant PP (polypropylene) plastic and rated up to 850 kPa, these valves are well-suited for outdoor garden systems, drip irrigation networks, and agricultural water tank installations. They are free from high-concern chemicals, making them appropriate for use in garden water systems.

Q: Do these valves require any special tools to install?

A: No special tools are required. Simply hand-tighten or use a standard wrench to thread the male BS connector into your compatible female fitting. Ensure the thread direction and size match your existing fittings before installation for a secure, leak-free seal.