RE: What is this ?
I had 3 of them on my old 1971 Trojan 36 woodie. One was a spare and the other 2 were used to support the freaxis pipe leading from the engine room to the Raritan electric head outlet. The engines ingested the Raritan solid waste from the effluent flowing through the freaxis pipe reactor.* Once holding tanks were mandated I threw out the freaxis pipe and the teak supports with resultant improved engine performance.