Brand: Allstar Performance Manufacturer's Part Number: ALL36181 Part Type: Fill Cap Kits Product Line: Allstar Performance Fill Plug Kits Automotive Fittings Part Number: AAF-ALL36181 UPC: 848238065367 Fill Cap Attachment Style: Bolt-on Cap Diameter (in.): 1.500 in. Cap Thread Size: 1 1/2 in.-12 Cap Material: Aluminum Cap Color: Black Bung Material: Aluminum O-Rings Included: Yes Quantity: Sold as a kit. Notes: Bolt-on bung, 1.375 in. diameter opening. Description: Allstar Performance fill plug kits enable you to put a fill plug where you need it. They include an aluminum or steel bung for use as an inspection plug or filler plug, plus an easy-grip cap with an O-ring for a positive seal. The kits are available with a small 1 3/8 in. opening or a large 3 in. diameter opening. These weld-on or bolt-on fill cap kits are available in a variety of styles and finishes.