Skip to content

Watchdog 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 sizes are designed to simplify installation. Standby equipment can be protected from internal moisture damage when the Watchdog Oil Dryer is installed.

Contact Us to Purchase


Visual Indication

When maximum adsorption is reached the silica gel turns from orange to dark green, indicating replacement is needed. The silica gel used is chemically inert, non-corrosive, and does not contain cobalt chloride, a heavy metal. The color changing dye used is environmentally safe and meets all health and safety requirements.

Additional Features

Engineered polymer provides high-temperature rating and excellent corrosion resistance
Multiple Purposes
Some models serve as a viewport, a fill port, and an oil dryer
Easy Installation
Some models contain a 1" NPT for easy installation on ANSI and API pumps.
Quick Cartridge Replacement
Desiccant cartridge replacement is simple and takes less than one minute.

Other Specs

Model Description Material Style Connection (NPT) Max. Operating Temp.
31807 Oil Dryer Polysulfone With Viewport 1 NPT 325ºF/160ºC
31808 Oil Dryer Polysulfone Without Viewport 1/2 NPT 325ºF/160ºC
31848 Oil Dryer Glass & Aluminum With Viewport 1 NPT 325ºF/160ºC
31849 Oil Dryer Glass & Aluminum With Viewport & Wire Guard 1 NPT 325ºF/160ºC

Desiccant Breathers