Filler Neck Housing, Billet Aluminum, Manifold & Neck, -16AN, O-Ring, Port O-Rings, Gaskets Top and Bottom• Black anodized billet aluminum housing with the included bolt- on billet aluminum radiator neck stands 3-1/4" tall, which locates filler neck at highest point to bleed off air on cars with low-mount radiators • The unit can be flipped 180° for either right or left water hose outlet location • -16AN female port is designed to be used with Nos. 22622, 63521, 63522, 63523, 63525 • No need to worry about gaskets because on the top and bottom of the housing are machined O-ring grooves with included O-rings • 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 • Includes bolts and washers