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Passive Oil Dryers

Watchdog® Oil Dryers are a passive drying system designed for bearing housings and other applications, where moisture condensation must be minimized. Relative humidity is substantially reduced in most applications. The compact design and standard thread size are designed to simplify installation. Standby equipment can be protected from internal moisture damage when the Watchdog® Oil Dryer is installed.


  • Watchdog® Oil Dryers contain a 1″ NPT port for easy installation on ANSI and API pumps
  • Desiccant cartridges change from orange to dark green color to indicate when replacement is required
  • Cartridge replacement is simple and takes less than one minute
  • Engineered polymer provides high temperature rating and excellent corrosion resistance
  • Multiple purpose – serves as a viewport, a fill port and an oil dryer


Model No. Description Material Style Connection
31807 Oil Dryer Polysulfone With Viewport 1 NPT
31808 Oil Dryer Polysulfone Without Viewport 1/2 NPT
31848 Oil Dryer Metal/Glass With Viewport 1 NPT
31849 Oil Dryer Metal/Glass With Viewport & Wire Guard 1 NPT

Replacement Cartridges

The Watchdog® Oil Dryer Replacement Cartridges are used with Watchdog® Oil Dryers. When the orange silica gel has turned dark green, remove fitting from the bottom of desiccant cartridge, dispose of the spent dark green desiccant cartridge, then replace with new cartridge.

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