The products,installed in the water pipeline and other pipelines toavoid stealing ,look the same as the ordinary ones but install concealedclutch device onthe internal valve stem ,which is mysterious when thespecial key is inserted into the bolt holes to adjust the on-off state,then control handwheel switch valve.

Benefits and Features:
Special wrench locking valve:
It is simple and convenient touse special wrench switch valve.
Soft-sealing gate valve with lock:
It has high level of safety that each valve,with lock device, can only be turned on with different keys