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Compact silver piston compressor vacuum pump unit with motor housing and fittings

Thomas

Thomas 688CE44 1/3 HP piston air compressor/vacuum pump 1.6 cfm 100 psi 115V

SKU CH-5TY6-R3ET4

Oil-free piston compressor and vacuum pump delivering 1.6 cfm at 100 psi and 27.6 in Hg vacuum from a 1/3 hp 115 V motor

  • Oil-free operation keeps air clean for sensitive applications
  • 1/3 hp motor delivers 1.6 cfm at 100 psi continuous pressure
  • Dual-purpose design functions as both compressor and vacuum pump
  • 6 in Hg maximum vacuum handles evacuation and hold-down tasks
  • Single-phase 115 V AC power plugs into standard workshop outlets

Thomas 688CE44 piston compressor/vacuum pump

The Thomas 688CE44 is a single-cylinder, oil-free piston unit that delivers both compressed air and vacuum from one 115 V AC motor rated at 0.333 hp. It suits laboratories, light industrial test rigs and OEM machinery that need a compact, maintenance-free source of pressure and suction without oil contamination.

Practical limits of 1.6 cfm at 100 psi

Free air flow is 1.6 cfm with a maximum continuous pressure of 100 psi and a maximum vacuum of 27.6 in Hg. The pump runs at 1,750 rpm, so sustained high-demand cycles will hit the flow ceiling quickly; it is not sized for continuous heavy pneumatic tools or large-volume evacuation chambers.

Installation notes and common issues

Inlet and outlet ports are 1/4 in NPT, allowing direct connection to standard fittings. The oil-free design removes lubrication schedules but the single-cylinder layout transmits noticeable vibration, so secure mounting and flexible hose couplings are recommended to prevent fitting fatigue and excessive noise.

Highlights

  • Oil-free operation keeps air clean for sensitive applications
  • 1/3 hp motor delivers 1.6 cfm at 100 psi continuous pressure
  • Dual-purpose design functions as both compressor and vacuum pump
  • 6 in Hg maximum vacuum handles evacuation and hold-down tasks
  • Single-phase 115 V AC power plugs into standard workshop outlets

Specifications

BrandTHOMAS

Questions about this item

Should I pick the 1.6 cfm version or a higher-capacity model for intermittent 100 psi use?

This unit delivers 1.6 cfm free air flow at a maximum continuous pressure of 100 psi, matching the intermittent rating. A higher-capacity model is only needed if your tools demand more flow than 1.6 cfm.

What does the 1.6 cfm rating mean when the pump is running on a 115 V circuit?

At 115 V AC single-phase, the 1/3 hp motor produces 1.6 cfm of free air flow at 1,750 rpm, so you can expect that volume at the outlet when the tank or line is at atmospheric pressure.

How does the 1/4 in NPT outlet limit the pressure or flow I can actually use?

The 1/4 in NPT outlet passes the full 1.6 cfm up to the rated 100 psi; it does not impose a lower cap, but downstream fittings or hose length can reduce effective flow.

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