Water maker end cap leak


Greetings All,
I developed a leak on the low pressure product water side of the watermaker membrane. It appears to be coming from the gray attachment piece fit directly into the end cap. I tried to tighten assuming it is threaded in. I can't see it as it would require dropping the membrane out of its holder. I am not on the boat now but would like to bring the part back with me. Does anyone know if it does thread in and is it a replacement part?  PA this is not on the bobbin side. Thanks for your time. 
Joy #388

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