Non-Spill reusable Flap Cap for water cooler bottles.

Ideal if you refill your own water bottles as it makes replacing a heavy bottle of water much easier and without the risk of water going every where.  

The rubber flap type is used if you have a spike or probe spill kit on your cooler, these are used to pierce sealed spring water bottles.  

These caps fit all standard size spring water bottles 55mm across the top.