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I think Suprman is selling them for $140. With shipping. The box is big so the shipping has got to be $50.+

Will or Suprman sells in a popular online auction site but also sells on SS at a better price.

Yes, it is Suprman Alexsha. Thank you. Stupid auto correct gets me Everytime!

I think Supreman is the only one selling the Purest air dyers. I think everyone else is selling just the stock M939 series air dyers. Those work good , but I was very impressed with the newest model.

I always deal with Supreman in Ct. I is a great guy, his stuff is still in the original box and his prices are very fair.

Buy them from Supreman here on SS he has the original air dyers and the up graded air dyers in the classified. They are new in the box and cheaper then what filters would cost.

Do you mean mechanically or price?

I was replacing them with a new unit, of the same design. Will had me out one on one of his own trucks.

I have been maintaining customer's M939 series trucks for a few years now and I am stating to see a lot of valve, check valve failures. The cause? None functional air dyers or poor operating dyers. I have been replacing the whole unit with new ones, but this time I used a Purest air dyer from...