Filler Neck Base; Adaptable Outlet Manifold Mounted; Use w/PN[63460/61/65/66] Or PN[63471]; H-2 5/16 in.; 1 in. NPT And 0.5 in. Machined Ports; Chevy; 6061-T6 Billet Alum.; • 1" NPT port is designed to be used with Nos. 63541, 63542, 63543, and 63544 • Black anodized billet aluminum housing stands 2-5/16" tall, which locates filler neck at highest point to bleed off air on cars with low-mount radiators • Has to be mounted with conventional gaskets or Moroso No. 63469 Filler Neck O-Ring Gasket • Includes a 1/2" NPT port for installing a water temperature sending unit and two 1/4" NPT ports to plumb return lines on popular aftermarket cylinder heads • The unit can be flipped 180° for either right or left water hose outlet location • Use with one of Moroso's Bolt-On Filler Necks NOs. 63460, 63461, 63465, 63466, or Block-Off Plate No. 63471