Conduit Seal : A sealing fitting poured with cement-like potting compound designed to contain an explosion in the enclosure to which it is attached. (See: Section 4.8.) (RP 14F)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}