The Senninger 3/4" Low Flow Pressure Regulator is an absolute necessity for protecting residential landscapes, raised beds, and light agricultural setups. Manufactured by Senninger—a global leader in irrigation pressure control—these heavy-duty regulators are engineered to safely drop high, fluctuating municipal or pump pressures down to a stable, reliable output. Supporting a low flow range between 0.5 and 8 Gallons Per Minute (GPM), they are perfectly designed for standard drip zones that utilize low-volume emitters and micro-sprays. For ultimate protection, install this unit downstream of a 3/4" irrigation filter and your automated irrigation valves.
To seamlessly integrate into PVC manifolds, these low-flow models feature standard 3/4" Female Pipe Threads (FPT) on both the inlet and outlet. They are available in two distinct models to match your specific landscape needs. The PR12 drops incoming pressure (up to 90 PSI) down to a gentle 12 PSI, which is ideal for running thin-walled Drip Tape. The PR20 model drops incoming pressure (up to 100 PSI) down to 20 PSI, making it an excellent choice for 1/2" poly tubing, standard punch-in drip emitters, and soaker lines.
Detailed specifications for system planning.
| Specification | Details |
|---|---|
| Product Type | Low Flow Pressure Regulator |
| Inlet / Outlet Size | 3/4" Female Pipe Thread (FPT) |
| Required Flow Range | 0.5 to 8 Gallons Per Minute (30 to 480 GPH) |
| Body Material | High-Impact Thermoplastic |
| Constant Pressure Rated | No (Must be installed after valves or timers) |
| Brand | Senninger |
| Part # | Regulated Output Pressure | Maximum Inlet Pressure | Flow Range |
|---|---|---|---|
| PR12 | 12 PSI | 90 PSI | 0.5 - 8 GPM |
| PR20 | 20 PSI | 100 PSI | 0.5 - 8 GPM |
Build your pipe-threaded drip irrigation head assembly safely.
Step 1: Prep the Threads
Because this unit utilizes standard Pipe Threads, you must apply 3 to 4 wraps of Teflon tape to the 3/4" male PVC fittings you will be threading into the regulator's inlet and outlet. Do not use liquid pipe dope.
Step 2: Connect the Inlet
Thread a 3/4" Male Pipe Thread (MPT) fitting from your upstream valve or filter 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
Thread a 3/4" Male Pipe Thread (MPT) PVC fitting or tubing adapter into the 3/4" FPT outlet of the regulator to transition safely into your poly mainline.
Step 4: Pressurize and Test
Turn on the irrigation valve. The internal diaphragm and spring will instantly drop the pressure passing through the unit, safeguarding your downstream drip lines.
Which model do I need: the 12 PSI or 20 PSI?
Your choice depends entirely on the type of downstream tubing you are using. The PR12 (12 PSI) model is specifically designed for very thin-walled Drip Tape (like 6 mil, 8 mil, or 15 mil) which will rupture at higher pressures.
The PR20 (20 PSI) model is excellent for traditional 1/2" poly tubing, standard punch-in drip emitters, and micro-sprinklers.
What happens if my flow is less than 0.5 GPM?
Pressure regulators require a certain volume of water passing through them to accurately engage the internal diaphragm. If your zone draws less than 0.5 Gallons Per Minute (30 GPH), this regulator will not function properly.
In extremely low-flow scenarios, the pressure will not drop accurately, potentially allowing dangerously high pressure into your drip lines. Always ensure your zone has enough emitters to meet the 30 GPH minimum.
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.
Please note the strict requirements for this pipe-threaded unit:
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