General description Gas tank nozzle replacement set, suitable for most 1/2/5/10 gallon oil tanks. The internal thread size ranges from 1-3/4 to 1.7 inches (approximately 3.9 cm), designed for tanks with a mouth measuring 1.75 inches (approximately 4.5 cm). This set includes a gas tank vent cap, thick rubber gasket, nozzle cap, and base cap. Technical specifications Internal thread size: 1-3/4 to 1.7 inches (about 3.9 cm) Compatible tank mouth size: 1.75 inches (about 4.5 cm) Compatibility and accessories Includes two types of gas tank vent caps: Tank Vent Cap-A for tanks without vents, requiring simple drilling and installation Gas Tank Exhaust Cap-B for tanks with a vent cover on the back, replacing the old exhaust cap Installation Simple drilling required for Tank Vent Cap-A installation Replace old exhaust cap with Gas Tank Exhaust Cap-B Usage Ensure to measure the size of your tank opening before purchasing Tighten the nozzle cap after use to prevent oil spillage Designed to