Zung
Contributor
I don't do EAN, so I have no problem with Buna-N, but a lot of people here swear by PU for the HP ring, so I ordered a bag just to see. Btw the "Millable Gum" is PU (polyurethane).
SP has reverted back to EDPM for whatever reasons, maybe cost; I've got 3 recent kits that come with those black rings with a red/brown stripe.
SP has reverted back to EDPM for whatever reasons, maybe cost; I've got 3 recent kits that come with those black rings with a red/brown stripe.