Netafim Guardian Air & Vacuum Relief Vent with Schrader Valve - 3/4-in MPT - 150 PSI

Protect Irrigation Lines From Vacuum and Water Hammer - 3/4-in MPT

When a hydroponic or irrigation line drains, the vacuum it creates can collapse pipe and pull debris into emitter lines. Air trapped at start-up can also cause pressure surges. This vent releases air as the line fills, closes once water arrives, and admits air when the line empties. Its composite body has no metal parts to rust.

This 3/4-in MPT unit is sold individually. It suits growers who need to protect a single manifold or branch, or who want to add vacuum relief to a small or mid-size system.

Key Features & Benefits

• Float-operated air vent — closes as water fills the line and opens when the line drains, so vacuum does not build up.
• Schrader valve included — lets you measure local line pressure with a standard gauge.
• Corrosion-resistant, UV-protected composite — suits outdoor and greenhouse installations without rusting parts.
• 150 PSI pressure rating — handles a wide range of line pressures.
• Opens at low air pressure — the vent stays open when air pressure is at or below 5 psi.

Who Should Use Netafim Guardian Air & Vacuum Relief Vent

Use it if you run hydroponic or drip systems with manifolds, valves, or sloped pipe runs that drain between cycles. It suits home gardeners and commercial growers alike.

About Netafim Guardian Air & Vacuum Relief Vent

Netafim makes the Guardian vent from corrosion-resistant, UV-protected composite. This model has a 3/4-in MPT connection, a 150 PSI rating, and an included Schrader valve. It is sold each.

Frequently Asked Questions

Q: Where should I install this vent?
A: Install it downstream of valves, usually at manifolds, to break vacuum when the system drains. You can also place it upstream of valves to discharge air at start-up. On sloping ground, it prevents pipes from collapsing as the network drains.

Q: What does the Schrader valve do?
A: A Schrader valve is a standard pressure-test port. Here it lets you attach a gauge to read the local line pressure.

Q: Will it rust?
A: The body is corrosion-resistant, UV-protected composite. It has no metal parts to rust or corrode.

Q: What is water hammer?
A: Water hammer is a pressure surge caused by sudden changes in flow. Large-capacity vents like this one help dampen it, which protects pipes and fittings from cracking.

Q: What pressure is it rated for?
A: It is rated to 150 PSI. The vent stays open when air pressure is at or below 5 psi, then closes as water fills the line.

Q: How does it work?
A: As water enters, a float rises and closes the vent. When the line empties or pressure drops, the float lowers and opens the vent to admit air.