The Watermaster Battery Watering Vent Cap is the patented key component used to set up batteries to be watered efficiently. Designed for simplicity, water delivery to each cell is accomplished using the natural force of gravity and without the intervention of any moving parts to wear out or break.

The Watermaster Battery Watering Vent Cap is the ONLY battery watering vent cap on the market with a double-interruption flame propagation barrier in the flow path linking the water tubing to the battery cells.

Conventional water traps do not work as expected in battery watering systems. Their narrow diameters effectively turn them into capillaries. The water held purely by capillarity - not gravity. Easily blown like a piston, ahead of propagating flames, into the cells .