Filler Neck Housing, Billet Aluminum, -16AN O-Ring, Port O-Rings Gaskets Top and Bottom• -16AN female port is designed to be used with Nos. 22622, 63521, 63522, 63523, 63525 • 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 • 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 • 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