Use when an alternative fuel source is needed, like when installing a nitrous oxide "wet" kit on fuel-injected motorcycles or as a fitting for an oil tank Requires a 9/16" hole for mounting; will work with any tank up to 5/8" wall thickness 1/8" NPT internal thread size for hose barb CNC-machined from billet aluminum; includes a high-quality Viton O-ring for a positive seal, a stainless steel nut and washer and an 80 micron filter Made in the U.S.A.. TANK BUNG WELDLESS