The MILS from Dallas Mustang have a male/female connection, so theres NO way to put them in backwards. I'm not going to even say they make a bad MIL because I wash my car alot, especially cleaning the engine compartment and in the winter I hit the touch-free washes and ALWAYS get the underbody wash. This probably has something to do with one of them going bad. I'll let you guys know what they decided to do for me
