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USD 28
Part #: PTWS100

AirDog WS100 Replacement Water Separator

For use on AirDog Air/Fuel Separation Systems
Part #: PTWS100
★★★★★ ★★★★★ 3 Reviews
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The AirDog Replacement Water Separator WS100 is a direct replacement for your AirDog Fuel System. The built-in drain allows you to empty any water from the filter during routine maintenance. The life expectancy for the Airdog Water Separator could be up to 25K miles or a year. However, those figures can change drastically depending on fuel quality. Order a few extra and keep them in your cab or toolbox.

  • Fits All AirDog & AirDog II Kits
  • Genuine AirDog Replacement
  • Replaces Part# WS80


  • MFG. Number WS100
  • Manufacturer Name AirDog by PureFlow
  • Shipping Weight 2.00 lb.
  • Shipping Length 13 in.
  • Shipping Width 10 in.
  • Shipping Height 7 in.
  • Fuel Type Diesel
  • UPC 813094013623
  • Warranty Yes
  • Warranty Info Limited Lifetime


★★★★★ ★★★★★
5.0/5 Stars out of 3 Reviews
Good fit
(Kansas) | September 5th, 2020
They alway seal tight and fit right. I drain it at least every oil change if not twice in between.
It takes the water out of your fuel
(Watertown MA) | May 17th, 2020
Works great and does its job
exactly what it appears to be.
(Gilmanton, NH) | March 7th, 2015
this filter is the perfect replacement for my air dog set up. easy on and easy off.

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Questions and Answers

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Most Popular Questions

Is this the replacement for all Airdog systems?
View Staff Answer 
The PureFlow Technologies AirDog Replacement Water Separator WS100 will fit all Airdogs used in Pickup Truck applications such as the 100GPH, 150GPH, 165GPH and 200GPH.
Dose the water sep. self prime?
View Staff Answer 

The AirDog is a self-priming system, however, to prevent potential damage and reduce the life expectancy of the system, it is recommended to pre-fill only the water separator with diesel fuel before initial startup.


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