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Pump, Centrifugal, 1/2hp

Price $400.00 / each

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  • Item # 5YU12
  • Mfr. Model # 331
  • UNSPSC # 40151503
  • Catalog Page # 3687
  • Shipping Weight 11.65 lbs.
Country of Origin USACountry of Origin is subject to change.
Note: Product availability is real-time updated and adjusted continuously. The product will be reserved for you when you complete your order. More

Technical Specs

  • ItemUtility Pump
  • HP1/2
  • Phase1
  • Voltage115
  • Amps8.0
  • Hz60
  • Inlet3/4" GHT
  • Outlet3/4" GHT
  • Motor EnclosureNema Type 3
  • RPM7500
  • Motor TypeAC/DC Brush
  • Service Factor1
  • Wetted MaterialsThermoplastic, Cast Aluminum, Brass, Stainless Steel
  • Impeller MaterialThermoplastic
  • Housing MaterialCast Aluminum
  • Volute MaterialCast Aluminum
  • Shaft Material300 Stainless Steel
  • Screw Material300 Stainless Steel
  • Seal TypeMechanical Cartridge
  • Seal MaterialCarbon/Ceramic Buna N
  • Seal ApplicationNonflammable and Nonabrasive Liquids Compatible with Seal Component Materials
  • Max. Liquid Temp.135 Degrees F
  • Suction Lift15 ft.
  • Max. Head105 ft.
  • Max. Pressure40 psi
  • Cord20 ft.
  • Best Efficiency GPM @ Head10 gpm @ 60 ft.
  • Best Efficiency Range GPM @ Head9 to 13 gpm @ 48 to 71 ft.
  • Max. Specific Gravity1.0
  • Max. Case Pressure100 psi
  • Inlet Pressure60 psi
  • Impeller TypeOpen
  • Bearing TypeBall
  • DutyIntermittent
  • Max. Dia. Solids1/8"
  • Agency ComplianceCSA
  • Manufacturers Warranty Length2 yr.
  • ApplicationWater Transfer
  • Height7"
  • Length9-3/4"
  • Width4-1/2"
  • Includes3/4" OD Brass Garden Hose Connectors and Plastic Suction Screen
  • GPH of Water @ 5 PSI1222
  • GPH of Water @ 10 PSI1091
  • GPH of Water @ 15 PSI936
  • GPH of Water @ 20 PSI793
  • GPH of Water @ 25 PSI654
  • GPH of Water @ 30 PSI504
  • GPH of Water @ 35 PSI342
  • GPH of Water @ 40 PSI180
  • GPM of Water @ 1 Ft. of Head24.0
  • GPM of Water @ 5 Ft. of Head23
  • GPM of Water @ 10 Ft. of Head22
  • GPM of Water @ 15 Ft. of Head21
  • GPM of Water @ 20 Ft. of Head19
  • GPM of Water @ 25 Ft. of Head18
  • GPM of Water @ 30 Ft. of Head17
  • GPM of Water @ 35 Ft. of Head16
  • GPM of Water @ 40 Ft. of Head15
  • GPM of Water @ 50 Ft. of Head13
  • GPM of Water @ 60 Ft. of Head11
  • GPM of Water @ 70 Ft. of Head8
  • GPM of Water @ 80 Ft. of Head6.5
  • GPM of Water @ 90 Ft. of Head4
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Alternate Products

Rated 3.5 out of 5 by 2reviewers.
Rated 4 out of 5 by Worked great. It is not self-priming which is the only negative that I can find with it. April 16, 2015
Rated 3 out of 5 by Have only used it once so review is based on that performance and description on the website. Contrary to the website the pump is not self priming and says so in the instruction manual. The black plastic knob on top of the pump housing in the picture is the priming port. We pumped from a 55 gallon drum to a waste treatment system at about the same height. We filled the pump casing full of water as per the instruction but the pump wouldn't lift water to self prime. After filling the suction hose the unit worked. We had to reprime when transfering the suction from one barrel to the next despite the foot valve.The unit appears solidly built so except for priming issues I expect it to work well. December 4, 2012
  • 2015-07-27T19:41:41.431-05:00
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Product Q&A

(1 Question : 1 Answer)

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1 answer


I want to pump water from a swimmng pool 50 foot,then up to the roof of my house,13 foot.Then through 500 foot of 3/4 black pipe,then back to the pool.How much will this pump circulate and will it work ?
1 year, 1 month ago
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¾” pipe will allow too much head pressure to build up for this pump to operate at a 500’ distance. Please contact us at 1-800-GRAINGER to discuss your application and we will be happy to assist you.

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1 year, 1 month ago
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  • 2015-07-27T19:56:05.248-05:00
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  • 2015-07-27T19:56:05.250-05:00
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