Senninger Medium Flow Regulator

Build your medium-flow drip irrigation head assembly safely.

Step 1: Prep the Inlet Threads
Because the inlet utilizes standard Pipe Threads (FPT), you must apply 3 to 4 wraps of Teflon tape to the 3/4" Male PVC fitting or filter you will be threading into the regulator. Do not use liquid pipe dope.

Step 2: Connect the Inlet
Thread the PVC fitting or pipe-threaded filter from your upstream valve into the 3/4" FPT inlet of the Senninger regulator. Crucial: Look closely at the body and ensure the directional flow arrow points downstream toward your fields.

Step 3: Connect the Outlet
Because the outlet utilizes Hose Threads (MHT), do NOT use Teflon tape on it. Simply thread a Female Hose Thread (FHT) tubing adapter directly onto the regulator. The adapter's internal rubber washer will create the watertight seal.

Step 4: Pressurize and Test
Turn on the irrigation valve. The internal diaphragm will instantly drop the pressure passing through the unit, safeguarding your downstream drip tubing.

Which model do I need: the 12 PSI or 30 PSI?
Your choice depends entirely on the type of downstream tubing you are using. The PRSMPH12 (12 PSI) model is designed specifically for very thin-walled Drip Tape (like 6 mil or 8 mil) which can rupture at higher pressures.

The PRSMPH30 (30 PSI) model is the industry standard for traditional 1/2" poly tubing, standard punch-in drip emitters, and micro-sprinklers.

What happens if my flow is less than 2 GPM?
Pressure regulators require a certain volume of water passing through them to accurately engage the internal diaphragm. If your zone draws less than 2 Gallons Per Minute (120 GPH), this medium-flow regulator will not function properly.

In low-flow scenarios, the pressure will not drop accurately, potentially allowing dangerously high pressure into your drip lines. For smaller flows, look for a standard Low Flow regulator.

Can I leave this regulator under constant pressure?
No, Senninger pressure regulators are not rated for constant pressure. They must be installed after an automated timer or irrigation valve so they only hold pressure when the system is actively watering.

Installing them upstream of a closed valve leaves the plastic housing pressurized 24/7, which can eventually cause it to stress, crack, or leak.

How should I winterize my Senninger pressure regulator?
Before freezing temperatures arrive, you must completely blow out or drain all water from your irrigation head assembly.

Any water left trapped inside the regulator's body will expand as it turns to ice, which will permanently destroy the internal diaphragm and crack the plastic housing. If you cannot blow out the lines, unthread the unit and store it indoors.