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Dayton 4KGZ9 Relief Valve

Dayton 4KGZ9 Relief Valve

Best price now

$45.85at AmazonObserved Nov 4, 2026, 4:57 PM

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Our take on the Dayton 4KGZ9 Relief Valve

The Dayton 4KGZ9 is a factory-set 150 psi relief valve built to protect positive displacement pumps from overpressure damage. Its nylon body, 304 stainless steel seat and steel spring are sized for a compact 5 1/4 in height and 2 1/8 in length, and it includes a test lever for manual checks. It is a narrow-purpose plumbing part rather than a general household valve. The best new price is $45.85 at Amazon as of November 4, 2026, with two stores listing it new.

Best forPump installers protecting positive displacement pumpsMaintenance crews replacing a failed 150 psi relief valveSmall-space plumbing where a 5 1/4 in valve fits
Pros
  • Factory set at 150 psi, so no field adjustment is needed
  • 304 stainless steel seat resists wear at the sealing point
  • Test lever included for manual operation checks
  • Compact size: 5 1/4 in tall, 2 1/8 in long
  • Nylon body keeps weight down
Cons
  • Fixed 150 psi setting cannot be changed for other systems
  • Nylon body is less tolerant of heat and harsh chemicals than brass or steel
  • No published standards listing, so code compliance must be checked locally
  • Limited store availability: two new listings

Dayton 4KGZ9 Relief Valve prices at every store

  • AmazonNew

    Availability unknown

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    $45.85Free shippingObserved Nov 4, 2026, 4:57 PM
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Also available at

  • WalmartCheck price at Walmart

Dayton 4KGZ9 Relief Valve price history

Lowest price we've seen: $45.85 on Nov 4 at Amazon. Tracked across 1 store since Nov 4.

About the Dayton 4KGZ9 Relief Valve

Valve, Body Material Nylon, Factory Set Pressure 150 psi, Disc Material Not Applicable, Overall Height 5 1/4 in, Application For Prevention of Damage to Positive Displacement Pumps, Overall Length 2 1/8 in, Seat Material 304 Stainless Steel, Spring Material Steel, Test Lever Test Lever Included, Standards Not Applicable

Specifications

color
OtherSource

Questions and answers

Is the Dayton 4KGZ9 worth it?
If you need a compact, factory-set 150 psi relief valve for a positive displacement pump, it does the job with a stainless seat and test lever. At $45.85 at Amazon as of November 4, 2026, it is a modest cost against pump damage.
Can I adjust the 150 psi set pressure?
No. The valve is factory set at 150 psi and is not designed for field adjustment. Choose a different relief valve if your system needs another cracking pressure.
What is the test lever for?
The lever lets you manually lift the disc to confirm the valve opens and the line is clear. Use it during maintenance checks, not as a substitute for a properly sized relief valve.
Will it fit my pump setup?
Check the inlet size and thread against your pump discharge before buying; the listing gives overall dimensions of 5 1/4 in height and 2 1/8 in length but not the connection size. The nylon body suits water service, not high-temperature or solvent lines.
What is in the box?
The valve itself with its test lever. No fittings, gauges or instructions beyond the valve are indicated.
When is it cheapest?
Only two stores list it new, so comparison is limited. The best new price seen is $45.85 at Amazon as of November 4, 2026; check both listings before ordering.
Where is the Dayton 4KGZ9 Relief Valve cheapest?
At Amazon, for $45.85, as of our latest check.
Where can I buy the Dayton 4KGZ9 Relief Valve?
2 stores we checked sell it, including Amazon, Walmart.

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