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Arimitsu 508L Forged Brass Triplex Plunger Pump - Left Shaft 1200 PSI, 8 GPM, 950 RPM

Mfr. Model #:
1.00121-027677 / A8010
KR Part #:
21.00 lbs
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A triplex plunger pump with a balanced flow crankcase providing quiet operation. Equipped with a left shaft measuring 22 mm in diameter. Handles a maximum pressure of 1200 PSI.

Technical Specifications

RPM: 950
Crankcase Capacity: 19 ounce
Inlet Port: 3/4 inch
Max GPM: 8
Max PSI: 1200
Shaft Diameter: 22 millimeter
Outlet Port: 1/2 inch
Outlet Port: 3/8 inch

Product Description

Quiet Plunger Pump - Left Shaft

Arimitsu's 508L is a triplex plunger pump with a left-handed shaft for use with dual gun prep units. Forged brass manifold is machined to deliver smooth fluid flow and resist corrosion. Valve assemblies are constructed with stainless steel to handle high temperatures and harsher chemicals. Ceramic plungers feature a proprietary blend of materials to provide increased thermal shock resistance and longer life. Handles a maximum pressure of 1200 PSI, flow rate of 8 GPM, and speed of 950 RPM.


  • Flow: 8 GPM
  • Pressure: 1200 PSI
  • RPM: 950
  • Inlet: Pressure: 70 PSI
  • Inlet: 3/4"
  • Outlet: 1/2" & 3/8"
  • Crankcase Capacity: 19 oz.
  • Shaft Diameter: 22 mm
  • Max Liquid Temperature: 175°F
  • Shaft Location: Left
  • Weight: 21 lbs.


  • Triplex pumps provide smooth liquid flow
  • Liquid cooled, low drag seals provide long life, improved suction, higher efficiency and longer dry running without damage
  • Balanced flow crankcase design and precision machining ensures uniform lubrication and quiet operation
  • Manifold is designed and machined to guarantee superior fluid flow
  • Zero-clearance exclusionary seals protect crankcase
  • Ideal for dual gun prep
  • Compact performance
  • Quiet, Compact, Long-lasting


  • 100% stainless steel valve assemblies deliver greater temperature and chemical handling abilities
  • Precision ground ceramic plungers utilize a proprietary material blend for long life and increased thermal shock resistance
  • Forged brass manifolds offer strength and corrosion resistance
  • Proprietary, proven seal blend maximizes life and increases maintenance intervals
  • Oversized crankshaft bearings for long life and quiet operation


  • No special tools required for repair or maintenance
  • Fluid end is easily serviced without entering crankcase
  • Easy access seal case and valve assemblies
  • Seals require no adjustment

Product Reviews

Frequently Asked Questions

Question:this page both says 8 and 10gpm which is correct and also will a 7.5hp elec motor operate this - tim (01/22/2021)
Response:The pump is rated for 8 gpm @ 950 RPM, and 10 gpm @ 1200 RPM. Yes a 7.5hp motor would work.
Question:my power washer is shuttering i have changed the unloader valve and it is no better could it be the Arimitsu 508 pump causing problem I checked washer and rings they seem to be ok - John (09/16/2020)
Response:Yes, you could pull the valves from the pump head and clean out any dirt/debris. Also check your pump inlet water supply to make sure you are not starving the pump for water.