I used the bulkhead for the a/c, don't have that part set up till the cj8 switch. I used their bulkhead for the heater hoses that are separate holes (do not recommend that style, not well made). Couldn't find a spot to put 4 way bulkhead with where battery tray (and brackets) is located. On cj8 I'll make sure they are the good bulkheads. Much easier to connect hoses.