What vent goes into a Harmon Thimble?

[Glenalmond]

Hello
I have a Harman OKA thimble and I am replacing the venting to it. Harman Part number and description is

Harman Direct Vent Wall Pass Through Thimble with OAK- 3" & 4" Pellet Vent Pipe, 1-00-677177​

If I read the description it calls for a Simpson Pellet Vent pro pipe. Simpson were boughtand integrated into the the DuraVent line back in 2010 as far as I can see. Does anyone know what brand and type of vent fits these Harman OAKs? I have a 3 inch pipe.

Thanks
Con

 

[johneh]

If it is a 3 inch vent 3 inch pipe fits

 

[tbear853]

I've used Simpson and Dura vent, either will fit if 3"