18.27—Gaskets.
A gasket(s) shall not be used between any two surfaces forming a flame-arresting path except as follows:
(a)
A gasket of lead, elastomer, or equivalent will be acceptable provided the gasket does not interfere with an acceptable metal-to-metal joint.
(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.