3 1/2” Nominal 8 TPI Locking Aluminum Diesel Fuel Cap

The locks are wonky and don't let the keys out when the lock is in the unlocked position, but for the price, it's a small inconvenience to deal with when the peace of mind knowing your fuel is safe from theives.

Fits just right

2 times received wrong size. But its good product if you r lucky to get proper size

Having the built-in lock is a great feature of this cap, certainly an upgrade.