BACKED BY A 12 MONTH FACTORY WARRANTY THIS IS A HIGH QUALITY LONG LASTING INDUSTRIAL GRADE AIR COMPRESSOR PUMP. THIS PUMP IS DESIGNED TO BE USED ON SMALLER 56FRAME ELECTRIC MOTORS RATED 2HP THROUGH 5HP MAX. THESE TYPES OF MOTORS USUALLY DRAW BETWEEN 15 - 21 AMPS AT 230V. IF YOUR MOTOR DRAWS MORE THAN 21 FLA AT 230V, OR IS ON A FRAME SIZE OF 56HZ, 145T OR 184T, YOU CANNOT USE THIS PUMP AND WOULD REQUIRE A LARGER PUMP. IF YOU ARE USING A 2HP MOTOR TO POWER THIS PUMP, YOU WILL HAVE TO SLOW DOWN THE RPM OF THE DO PREVENT OVERLOAD ON YOUR MOTOR. THE RPM OF THE PUMP WITH A 2HP MOTOR SHOULD BE AROUND 700RPM AND WILL GIVE YOU 5-8 CFM FLOW RATE ON AVERAGE. WITH A 5HP MOTOR SPINNING AT IT MAX RPM WOULD GENERATE BETWEEN 16-18 CFM WITH THIS MSL18MAX PUMP. WE HIGHLY RECOMMEND YOU SPIN THIS PUMP BETWEEN 700-1200 FOR BEST RESULTS AND GREATEST LONGEVITY. 18 CFM DISPLACEMENT MAX 42 LB CAST IRON 2 CYLNDER PUMP 2 CYLINDER PUMP WITH 3" PISTONS - OIL LUBRICATED (ISO 9002) - DISCHARGE PORT ON THE HEAD IS 1/2" FEMALE NPT - OIL SIGHT GLASS LOCATED ON THE FRONT TO VIEW OIL LEVELS AT A GLANCE - REVERSIBLE HEAD FOR RIGHT OR LEFT DISCHARGE - OVERSIZED CRANKCASE ALLOWS FOR LARGE OIL CAPACITY - LARGE SWEDISH STAINLESS STEEL REED VALVES MANUFACTURERS SUGGESTED RPM 1190 MAXIMUM PRESSURE 125 PSI PUMP FLYWHEEL 11.5" OUTSIDE DIAMETER SINGLE GROOVE FOR ONE BELT, 1/2" TOP WIDTH A/4L SECTION BELT. BELT NOT INCLUDED WE ALSO INCLUDE ONE IN-TAKE FILTER ASSEMBLY FREE OF CHARGE THIS PUMP WILL REPLACE MANY OTHER OEM PUMPS ON THE MARKET DEPENDENT ON BOLT PATTERN. APPLICATIONS WHERE THE BOLTS DO NOT LINE UP, SIMPLY DRILL NEW BOLT HOLES ON THE COMPRESSOR PLATE TO ALLOW THE PUMP FLYWHEEL TO LINE UP WITH YOUR ELECTRIC MOTOR PULLEY. THIS PUMP CAN BE USED WITH A MAXIMUM OF A 5HP ELECTRIC MOTOR. PUMP DIMENSIONS: WHEN VIEWING THE FRONT OF PUMP, THE BOLT MOUNTING HOLES ARE 5 7/8" C.