2018 Nitro z19 trailer, sorry dont know that model off hand.. Had to replace passenger(truck not boat) side caliper. Part # 46304. The way mine is set up the bottom hole is a plug and the top 2 are a bleeder and the brake line hook up from opposite side.
New part comes with feed fitting in the bottom and blenders on the top. Same replacement OEM part.
Do I leave it how it is or set up like mine was originally? I believe these parts are used on both sides so different configurations are possible, making me lean towards it being ok to switch it to old setup.