Billet 2 port carb. regulators. Made from billet 6061-T6 aluminum, these regulators are an ideal replacement/upgrade for the traditional Holley style 2 port regulator. -8 ORB inlet and outlet seals with an o-ring, no sealant needed. Available in your choice of 2 adjustment ranges, 1 - 4 PSI or 4.5 - 9 PSI. Comes with mounting bracket and screws.