This battery vent adapter was originally designed to retrofit our #4000600 Battery Water Level Indicator to a Varta RL 840 battery (manufactured by Enersys). Our adapter will also fit any other battery that has a vent hole with M27-3 threads. In addition, this adapter enables you to adapt any quarter-turn bayonet style vent cap to your battery.
We manufacture other battery vent adapters which can be viewed by clicking on the links below.
Battery Vent Adapter #4D-8D-PIA
Battery Vent Adapter #4D-8D-SIA
Battery Vent Adapter #1050VCA
Battery Vent Adapter #M22X1.5