The Deckhead Mounting Box, is a device which protects bases, sounder bases and sounder beacon bases from the ingress of water or other liquids. It is screwed to the soffit and accepts a variety of Apollo bases.
The Deckhead Mounting Box is used on its own in most cases but there are applications where either an extension sleeve or an adaptor ring is required.
The Extension Sleeve is required when fitting heater or deep bases; the Adaptor Ring is needed for fitting sounder bases, beacon bases or sound beacon bases.