Milwaukee Twins Vented Non-Locking Replacement Aircraft Gas Cap This Vented Non-Locking Replacement Aircraft Gas Cap from Milwaukee Twins features a low-profile design. It provides a reliable, high-tech option for your fuel system. Formerly offered under the J&P Cycles brand. Features: Low-profile high-tech replacement gas cap These are replacement caps for the following tanks that we carry: Stretched Fat Bob Tanks for 1984-99 Softail, Flatside Gas Tanks for 1984-99 Softail, and One-Piece Gas Tanks for 2000-07 Softail