I purchased one from someone online and there is no epoxy. Without knowing anything about plumbing or irrigation supplies I have figured out what the fittings are, I THINK. Yes the silver piece is lamp thread, but that is not as important.
Basically the male irrigation adapter, the black piece with the barb side cut off screws into the black iron pipe with the side that has the hex nut shape on it. Basically it threads from the side that is not really meant to thread. Then on the other end he attaches a female mender to the other end of the thread.
So I am down to finding a piece that will screw in from both ends, but is reduce on one side on the inside. The reason the inside needs to be smaller than the 3/4" thread is to recess a small rotary switch in side the thread (that is what the pipe thread is for to attach the rotary switch to. I know this sounds confusing,but this is what I need. I have tried about 6-7 irrigation male to barb adapters with only one kinda of working, I have asked the guy I purchased from but he will not tell me the piece. I understand that I suppose.
Thanks for all the input.