Best place to get a HKS GT dump valve diaphragm?

mdr40z

New Member
Mar 31, 2005
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I blew mine again today, happened to me about 2 years ago too. It's an old school GT series with a 14 psi spring iirc.
I don't remember where I got it the last time but I didn't remember it being $110, I'd like to replace it with the newer GT II series but they are like $700.
Any ideas?