Senninger® PMR Pressure-Master Regulator™ — 3/4in NPT(F) × 1in NPT(F) / 15 psi / Medium Flow

Preset Pressure Regulation for Consistent Sprinkler Output, 15 PSI Medium Flow

Line pressure in a sprinkler or drip zone rarely stays constant, drifting with elevation changes, pipe friction, and shifts in demand elsewhere on the system, which throws off uniform water application at every head. Senninger's PMR Pressure-Master Regulator holds a fixed 15 psi outlet pressure regardless of those upstream swings, so every sprinkler or emitter on the line gets the pressure it was designed around.

This medium-flow version covers 2-20 GPM through a 3/4in NPT(F) inlet and 1in NPT(F) outlet, sized for a single zone or lateral run in a commercial greenhouse or field irrigation manifold.

Key Features & Benefits

• Preset 15 psi outlet — holds downstream pressure steady so sprinkler and emitter performance stays consistent regardless of upstream pressure swings.
• 2-20 GPM medium flow range — sized for a typical zone or lateral run rather than a single emitter or a full main line.
• Low hysteresis — keeps outlet pressure stable as flow increases or decreases through the cycle, without hunting or overshoot.
• Stainless-steel internal spring — resists corrosion for a longer service life in outdoor and greenhouse environments with chemical exposure.
• 3/4in NPT(F) x 1in NPT(F) connections — standard NPT threading fits directly into existing irrigation manifolds and headers without special fittings.

Who Should Use This

This regulator fits greenhouse irrigation designers, drip and overhead system installers, and commercial growing operations dealing with uneven terrain or variable supply pressure. It's especially useful in multi-zone systems where pressure differs zone to zone because of elevation changes or long lateral runs.

About Senninger Irrigation

Senninger Irrigation has designed sprinklers, nozzles, and pressure regulators since 1963 from Clermont, Florida, and has been a Hunter Industries subsidiary since 2016. The company's pressure regulator lines, including the Pressure-Master series, are built to hold a fixed downstream pressure across a range of preset values and flow rates.

Frequently Asked Questions

Can this regulator be adjusted to a different pressure?

No, PMR regulators are factory-preset rather than field-adjustable. Choose the preset pressure, such as 15, 20, 25, or 30 psi, that matches your sprinkler or emitter's design pressure before ordering.

What happens if inlet pressure drops below 15 psi?

A pressure regulator can only hold pressure at or below its preset value, so if inlet pressure falls below 15 psi, the regulator passes that lower pressure through rather than boosting it. Regulators reduce and stabilize pressure, but they can't add pressure the supply line doesn't have.

How do I install this regulator in an existing manifold?

Thread the 3/4in NPT(F) inlet and 1in NPT(F) outlet into your existing irrigation manifold or header, installed in the flow direction marked on the regulator body. No special tools are needed beyond standard NPT fitting installation.

Is this regulator suitable for fertigation?

The thermoplastic body handles dilute fertilizer solutions used in typical fertigation programs. Confirm compatibility with concentrated or specialty chemicals before using it in a fertigation system.

Can it be installed in either flow direction?

No, pressure regulators are directional devices, so install this one with flow moving from inlet to outlet as marked on the body. Installing it backward will prevent it from regulating pressure correctly.