Locking cap only for 1928-29's which is threaded. The rear of the cap has an allen headed set screw to lock it down once in position to prevent theft. Top portion of the cap has a hole in it to accept the A-18354-CR or -WR moto meters.

Once in position, you simply give the upper portion of the cap a counter-clockwise twist and the upper portion and the moto meter simply pivot back so you can check your fluids. Chrome plated. U.S.A.

A-18360-B

Locking cap only for 1930-31's which is secured with 2 tabs. Similar to your original radiator cap except the two tabs lock in place with an allen headed screws to prevent theft. Top portion of the cap has a hole in it to accept the A-18354-CR or -WR moto meters.

Once in position, you simply give the upper portion of the cap a counter-clockwise twist and the upper portion and the moto meter simply pivot back so you can check your fluids. Chrome plated. U.S.A.

NOTE:  The Brassworks does not make these, they are imported from Taiwan and assembled in the USA and, if you have a reproduction radiator from another company, you will have to modify this cap to work. Here are the instructions.