PTO Drive Compressors




The 375-UBI takes up no space, frees up your tow hitch, and is cost efficent. In addition, the compressor is lightweight, having fewer parts and runs off a vehicle engine. If the truck runs, the compressor runs when activated!

The advanced design allows you the option to choose up to 375 CFM and up to 110 PSI continuously. Generators, welders, and hydraulic systems may be intergrated with the 375-UBI kit or in-house installation.


Delivery @ 100psig*225 cfm275 cfm325 cfm375 cfm
Input Speed to Compressor Shaft (rpm)1385169020002300
Fluid Capacity (gal)
Compressor Air-end14" W x 11" H x 27" L
Receiver Sump12" dia x 33" L
Gauge Package4.75" W x 3" H x 8" L
Weight (dry)700 lbs


Quantity of one (1) Boss Model 375-UBI PTO drive under deck air compressor(s) to include the following as standard equipment:

  • Boss oil flooded, rotary screw air-end designed to produce up to 375 CFM @ 110 PSIG continuously.
  • Gear set incorporated into air-end.
  • Two-year warranty on the air-end.
  • Remote mount vertical oil receiver tank with filler port and lubricant level sight glass. Exterior shell of vessel to be welded so as to be one piece. Bolt-on lid with in tank replaceable coalescing filter element.
  • Engine speed & air inlet controls for automatic modulation of engine speed to match air demand.
  • Remote mount, self-contained, aerodynamically designed cooling package with automatic thermal sensing control to ensure proper operating temperatures.
  • Replaceable spin-on compressor lubricant filter with safety bypass and 25-micron rating.
  • Remote mount two-stage, dry-type air intake filter with replaceable filter.
  • Instrumentation to include: hour meter, compressor lubricant temperature gauge, and air pressure gauge.
  • Hoses, fittings, electrical wire, and hardware necessary for standard installation and operation.
  • Safety devices to include: minimum pressure valve, compressor lube hi-temp and hi- pressure safety system, automatic blowdown device, high-pressure relief valve, and necessary warning and information decals.
  • ´┐╝´┐╝Operation, parts and maintenance manual.

Compressor Data and Minimum Chassis Specifications

Compressor input RPM: 2300
Compressor HP: 93
Compressor Torque: 212 lbs/ft (condinuous duty)

Transmission mounted PTO must be capable of 302 lbs/ft intermittent duty and 212 lbs/ft continuous duty. Manual transmissions require the use of a PTO lube pump option with auxiliary lubricant cooler. PTO must be engine rotation.

Engine HP must be capable of running compressor at rated PTO % (i.e.: 140% PTO or 1.4 divided by 2300 compressor input RPM = 1642 engine RPM. Engine must be capable of 93 HP @ 1642 engine RPM).

Back of cab dimensions required for the typical cooler and receiver tank installation is 30.5".

* Standards & specifications subject to change without notice.