All types of battery that are Lead Acid type have open holes generally called Vent Holes, which are openings through which Electrolyte Fluid is poured into it.  When a battery is being charged it is usual for the battery to spew out acid fumes through these Vent ports. Acid fumes, we know are harmful and hence it has become a practice to make use of Vent Caps, to prevent excessive fumes from escaping.

The escaping gases are not only corrosive but also often highly inflammable which could also lead to a fire hazard. However another point to note is that different Caps have different types of threads and that means various types of Battery Vent Caps in use. It is here that a simple device such as a Vent Cap Adaptor, that makes it possible to use a wide range of Vent caps. A vent cap adaptor can couple with different types of battery Vent Caps, making it a high utility and sought after battery accessory item from JK Ceraplast.