Larry
I don't know what you call them in the states, maybe a bushing ?they are a two
piece metal gland ( made from stainless steel )you order them by the size of
the ID eg. 3/8 or 1/2 inch there are many sizes, one screws into the other
and forces a rubber or nylon bushing to seal whatever is put through them ( I
use them for electrical cables in explosive atmospheres or where intrinsically
safe devices are used) if you want to use them with a moving part just make
the rod slightly smaller or the ID of the gland slightly larger and screw the
gland together until there is a slight interference, this will most certainly
seal out any smoke or flame and stop any light shining through ( no need to
con the inspector) make sure they are the metal ones and not the plastic type
hope this helps
I intend to use them for all my electrical cables and air lines that passed
through the fire wall also the throttle cable etc. on my liner
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