Redesigned from the ground up, the new Vee Port PRO is 20% smaller and 33% lighter than its predecessor. Featuring a hard anodized aluminum piston, the new Vee Port PRO offers high flow capabilities in a lighter, more compact package. Precision machining and assembly - the piston and valve body are measured to mere fractions of a millimeter, and perfectly matched to fit each other exactly. Because of this precision, an o-ring is not needed to create a seal. Some applications may require a BOV Adapter or fitting. Supplied with 38mm alloy hose/weld-on adapter, V-Band clamp, 360 degree swivel vacuum fitting, and White Spring rated -21 to -19 InHg (installed).