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Rain Bird M30X 30 PSI Inline Pressure Regulator 3/4" FPT | PSI-M30X-075

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Rain Bird PSI-M30X-075 3/4" in. 30 PSI Inline Pressure Regulator

Regulates outlet pressure to 30 PSI, can be installed above or below ground.

  • Can be installed above or below the ground.
  • Preset outlet pressures: 30 PSI (2;0 Bars); 40 PSI (2;8 Bars); 50 PSI (3;5 bars).
  • 3/4" in. (20/27) or 1" in. (26/34) female-threaded inlet and outlet.

Operating Range - Flow:

  • PSI-L30X-075: 0.10 to 5.0 GPM; 6 to 300 GPH (23;0 to 1135 l/h)
  • PSI-M30X-075: PSI-M40X-075; PSI-M50X-075: 2.0 to 10.0 GPM; 120 to 600 GPH (454 to 2271 l/h)
  • PSI-M40X-100: PSI-M50X-100: 2.0 to 15.0 GPM; 120 to 900 GPH (454 to 3407 l/h)

Operating Range - Inlet Pressure:

  • PSI-L30X/M30X: 10-150 PSI (0;7 to 10;3 bars)
  • PSI-M40X-075/100: 10-150 PSI (0;7 to 10;3 bars)
  • PSI-M50X-075/100: 10-150 PSI (0;7 to 10;3 bars)

(Note: For inlet pressures that exceed the operating range; specify/install two regulators in series.)


  • PSI-L30X-075: 3/4" in. 30 PSI (2;0 bars) regulator for low flow (red label)
  • PSI-M30X-075: 3/4" in. 30 PSI (2;0 bars) regulator for medium flow (yellow label)
  • PSI-M40X-075: 3/4" in. 40 PSI (2;8 bars) regulator for medium flow (yellow label)
  • PSI-M50X-075: 3/4" in. 50 PSI (3;4 bars) regulator for medium flow (yellow label)
  • PSI-M40X-100: 1" in. 40 PSI (2;8 bars) regulator for medium flow
  • PSI-M50X-100: 1" in. 50 PSI (3;4 bars) regulator for medium flow
Rain Bird
Product Tag:
Top of the Line
Size (in.):
30 PSI
Flow Rate:
2 - 10 GPM
Valve Pressure Regulator
Product Type:
Valve Pressure Regulator
Average Rating:
5 Stars
5.0 / 5.0
1 Review
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Works exactly as advertised.
Used this unit to limit the pressure to my drip irrigation manifolds. no more blown off lines due to high water pressure.
June 29, 2020
over 5 years ago
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 8 questions Browse 8 questions and 22 answers
Why did you choose this?
SprinklerWarehouse.com Store
It’s what I need
G K on Nov 4, 2018
reduce pressure on open loop Geothermal well system
Kenneth K on Dec 10, 2017
It’s what I need
G K on Nov 4, 2018
adding a garden
T O on May 10, 2018
reduce pressure on open loop Geothermal well system
Kenneth K on Dec 10, 2017
immediate use
Jeffrey R on Aug 2, 2017
adding a garden
T O on May 10, 2018
immediate use
Jeffrey R on Aug 2, 2017
I have a water source directly from meter to hose bibb. Then hose bibb goes pvc to back flow preventer and then on to timers. Water pressure at back flow preventer was tested at 135 psi. I would like to reduce this to about 60-70 psi. Is this regulator adjustable within this range? Does this regulator have a built in filter or will I need a separate filter between regulator and back flow preventer?
Joevol on Jul 8, 2014
Can the Rain Bird PSI-M30X-075 3/4 in. 30 psi Inline Pressure Regulator be installed ahead of a manifold to regulate 6 stations?
A shopper on Aug 18, 2014
BEST ANSWER: It could be however i would check to make sure the GPM through each zone does not exceed the GPM through the M30X. I install these for drip irrigation using the Rainbird wye filer. each drip zone is controlled by the valve at the manifold. I run up to three drip irrigation stations from one valve. More control and less $$$.
can I get a CAD model for this PSI-M30X-075 please?
I also wish to know whether the materials it is made of might get affected by a 0.6M phosporic acid solution or a 0.4M Sodium Persulphate solution.
Contact me on pprabhud @ hach . com
Parijat P on Feb 17, 2012
Can the regulator be buried underground inline with irrigation system?
A shopper on Feb 26, 2016
BEST ANSWER: I have mine both underground and in valve boxes. Where they didn't fit inside the box I burried them just outside the box. I have eight valves running off 2 house external taps at 72psi. I needed to lower the psi to 30 to work with the rainbird MPR,VAN nozzles and my drip system. They just have to be downstream from valves.
Where does the regulator get installed?
A shopper on May 24, 2013
BEST ANSWER: The short answer is always after the valve and before OR after the filter.

Additionally.....Some professionals install them after the filter so the water going through the regulator has already been filtered (decreases chance of sediment damaging the effectiveness of the regulator) and you don't experience additional pressure loss due to the filter because you likely still have higher pressure after the filter than you are stepping down to with the pressure regulator. Other professionals install it before the filter because, though quality filters are designed to withstand the pressure spikes experienced by parts installed before a pressure regulator, a pressure regulator is better at this and has less threaded joints that can leak under high pressure and/or improper teflon taping (2 threaded joints vs. 4).

As long as you install both your filter and your pressure regulator after your valve and in the correct direction for flow (see arrow or each part), then you can put them in either order for the desired pro's and con's.
With this you still need a backflow preventer correct?
Ethan R on Jan 23, 2020
BEST ANSWER: This inline pressure regulator is just that. It regulates the pressure in the irrigation system. A Backflow (anti-syphon) device prevents water in the irrigation system from returning to the source or point of connection for the irrigation system. A general rule is the Backflow device must be a minimum of 6" higher than the highest sprinkler on the system.
I have low pressure through out my sprinkler system. Water comes directly from my water line to the sprinkler system. the sprinkler heads barely rise.What can I do?
A shopper on Apr 28, 2020
BEST ANSWER: You certainly don't need to add a pressure regulator! There could be all sorts of hidden problems going on. Are you running from a pump or a well (have it serviced), or a municipal water source (the overall pressure in a newer development can drop over time as homes are added to the system). Other likely culprits: clogged water filter, kinked main line, or partially-opened valve at the vacuum breaker. I would call a reputable sprinkler company in your area (one that's been servicing systems for a long time), a service technician is likely to be able to diagnose your situation quickly.