StacksVerified U.S. regulatory reference

30 CFR §18.27

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
A gasket(s) shall not be used between any two surfaces forming a flame-arresting path except as follows:
  1. (a)A gasket of lead, elastomer, or equivalent will be acceptable provided the gasket does not interfere with an acceptable metal-to-metal joint.
  2. (b)A lead gasket(s) or equivalent will be acceptable between glass and a hard metal to form all or a part of a flame-arresting path.