These replacement water manifolds are intended for the ZL1 LSA supercharger cover. They are made from a single piece of 6061 aluminum and feature dual 12 ORB connections so you can adapt to whatever type of AN connections you may need. The internal orifices are 0.610″ diameter all the way through and machined smooth to allow excellent flow in and out of the intercooler brick. They are anodized black for protection against pitting and a superior appearance.