I am looking for a cap that goes on the bottom of the oil filter sandwhich adapter. The part from mercruiser is 15820T, but is NLA. Looked at multiple sources, none in stock, NLA. The cap basically replaces an oil filter, and allows the oil to go to the remote filter and cooler. Found one on eBay for $200, I can purchase a complete adapter for less, but most are 1/2" ports, the one I have is 5/8".