class A stove pipe ID

[burnham]

I have some 6" class a pipe for a chimney on my Mansfield, and need more. My current setup is about 2' too short, so it drafts like poo. I'm having a little trouble finding a piece to match. The male end of the existing pipe has 8 raised sections that lock into the female end by twisting the pipe a little. The house was built in '85, and I think the chimney was installed then. I can't find any ID tags on my existing parts. Any ideas as to how I can figure out what brand I have? Thanks, Todd

edit I think it's Simpson Duravent, but I'm not sure.

 

[Wood Heat Stoves]

pictures er something?

 

[burnham]

well it wasn't simpson duravent.....until I introduced it do a 21oz estwing framer and a rivet gun. job done.