Raindrip Hose/Pipe Anti-Syphon Fitting - 3/4in FHT Inlet x 3/4in MHT Outlet

Backflow Preventer for Pipe-Fed Drip Zones Running Hose-Thread Tubing

Many drip zones are actually fed from a pipe-threaded valve or manifold outlet upstream, with a hose-thread adapter already in place to accept standard garden hose and drip fittings downstream. Raindrip's anti-syphon fitting is built for exactly that junction, threading onto the hose-thread side of the connection with a one-way valve that blocks irrigation water from siphoning back toward the supply if pressure drops.

With a 3/4in female hose thread inlet and 3/4in male hose thread outlet, high-impact ABS construction, and a 480gph maximum flow rate, it drops in ahead of the next length of hose or drip tubing without needing a separate backflow device elsewhere in the run.

Key Features & Benefits

• One-way backflow prevention — stops irrigation water from siphoning back into the fresh water supply if pressure drops or a siphon condition develops.
• 3/4in FHT x 3/4in MHT connections — standard hose thread on both ends for a straightforward install between a threaded outlet and the next section of hose or tubing.
• High-impact ABS construction — durable material built to handle continuous outdoor irrigation exposure.
• 480gph maximum flow rate — supports high-volume drip zones and general garden watering without restricting flow.
• Includes filter washer — screens sediment and particulates at the inlet before they reach downstream emitters.

Who Should Use This

Growers and irrigation installers running drip zones off a pipe-threaded valve, spigot, or manifold outlet that's already fitted with a hose-thread adapter benefit from this fitting's backflow protection at that connection point. It suits any setup where local code or good practice calls for a check valve between a potable water source and a drip system.

About National Diversified Sales

Raindrip has been the drip and micro-irrigation brand of National Diversified Sales (NDS) for more than 30 years, supplying backflow and safety fittings alongside its broader tubing and emitter lineup. NDS traces its own history to 1972 and has kept its wider catalog centered on efficient, reliable water-delivery hardware.

Frequently Asked Questions

What is an anti-syphon fitting?

An anti-syphon fitting, or backflow preventer, uses a one-way valve to stop water from flowing backward from an irrigation system into the fresh water supply. This protects drinking water from contamination by fertilizer, soil, or debris that may be present in the drip line.

Is this fitting suitable for a pipe-threaded manifold outlet?

Yes, it's a common choice for zones fed from a pipe-threaded valve or manifold that already has a hose-thread adapter in place, since the fitting's own connections are standard 3/4in hose thread on both ends. Confirm the upstream adapter's thread size matches before ordering.

What is the maximum flow this fitting supports?

This fitting supports a maximum flow rate of 480gph, which comfortably covers most residential drip zones and general garden watering demand. Larger commercial layouts with many zones running simultaneously should check total flow against that limit.

What does the included filter washer do?

The filter washer sits at the inlet connection and screens out sediment and particulates before they reach the drip system. Rinsing it periodically keeps flow steady and helps protect downstream emitters from clogging.

How is this different from a hose-to-hose anti-syphon fitting?

Both use the same one-way valve principle, but this model is positioned for installs where the upstream side is fed from pipe-threaded plumbing rather than a simple two-hose connection. The downstream hose-thread connections work the same way in either case.