HO Type F Unit Train Dummy Coupler

This Type F dummy coupler is compatible to "Sergent Engineering" HO scale couplers and can be coupled and uncoupled with any sergent coupler type.
The tight lock feature of this coupler has been modified to allow it to be coupled by hand for those that want to operate unit trains while retaining most of the look of the prototype. 

Just like regular Sergents, these couplers have much less slack action than regular knuckle couplers making them ideal for long trains that do not need switching.