Rainbird National Sls DASASVF100 Anti-siphon Valve 1 in

Product Description

The RAINBIRD NATIONAL SLS DASASVF100 is a 1-inch Sure Flow Automatic Anti-Siphon Valve designed for professional-grade irrigation system control. This valve features a reverse flow design that helps prevent flooding in the event of an internal diaphragm failure by keeping the valve closed, conserving water. An adjustable, top-mounted flow control knob allows technicians to reduce misting caused by excessive water pressure and optimize flow to each zone for more uniform sprinkler coverage. It ships in a package quantity of 5 units, making it well suited for multi-zone installation jobs.

This anti-siphon valve is intended for residential and light commercial irrigation systems where backflow prevention is required at the zone level. The built-in anti-siphon design eliminates the need for a separate backflow preventer at each zone valve location. It is commonly installed in lawn and landscape irrigation applications by licensed irrigation contractors or qualified plumbing professionals. The external bleed screw allows manual flushing of dirt and debris from the system immediately after installation and before initial startup, which is a required step before placing the valve in service.

Key Features

• Reverse flow design keeps valve closed during internal diaphragm failure, preventing flooding and water waste
• Adjustable flow control reduces wasteful misting when water pressure is too high
• Top-mounted, easy-turn flow control knob optimizes zone flow for uniform sprinkler coverage
• External bleed screw enables manual system flushing of dirt and debris before startup
• Professional-grade construction suitable for contractor installation
• Sold in a pack of 5 valves for multi-zone projects

Compatibility

Designed as an OEM-style replacement or new-install anti-siphon zone valve for 1-inch residential and light commercial irrigation systems requiring integrated backflow prevention.

Installation Notes

Installation should be performed by a licensed irrigation contractor or qualified plumbing professional in accordance with local plumbing and irrigation codes. Shut off the water supply to the system before installing or servicing this valve. After installation, flush the system manually using the external bleed screw before activating automatic operation to clear dirt and debris from the line. Do not operate the valve without first completing the flushing procedure, as debris can damage the diaphragm and cause valve failure.