![Cim-Tek Pre-Vent Cap (Locking)](http://store.mwpetroleum.com/cdn/shop/products/60002_43fa8445-5a8d-4da2-86e2-e7b1d2031eb0_{width}x.jpg?v=1676665953)
Cast-iron base with Pre-Vent cap. The Pre-Vent is a fill cap with a pressure and vacuum release that reduces evaporation in fuel storage tanks and helps maintain the quality of stored fuel. This cap has a cast iron lock to help prevent theft of fuel.