Battery Vent Cap Adapters

There are several situations where a Battery Vent Cap Adapter may be needed. The reasons for replacing your original battery vent cap with a different one may include:

1) The original vent cap is broken or lost, and you need a replacement battery cap.
2) You want to replace the original cap with a red, yellow, blue, orange, black, or white vent cap.
3) The original vent cap does not contain a flame arrestor, and you want to replace it with one that does.
4) The original vent cap is too short which causes the top of the battery to become wet when the electrolyte splashes or overflows. A taller vent cap helps to keep batteries dry.
5) The original vent cap allows the electrolyte to evaporate too quickly, and you want to replace it with a Water Miser cap so that you don’t need to add water as often.
6) You want to check the electrolyte level without removing the vent cap, so you want to replace it with a level indicator that needs an adapter to fit your battery.

Whether the original vent caps on your battery are the screw-in type (threaded) or the push-in style, we manufacture a battery vent cap adapter that will retrofit any quarter-turn bayonet vent cap to most batteries. To purchase, just click on any adapter picture below to enter our online store.

We have battery vent adapters to fit many batteries, including push-in style 4D and 8D batteries that have a 3/4" diameter vent opening. Our 1050VCA adapter is for push-in style European batteries and select models of Douglas batteries having the same type of vent well. We also make screw-in adapters to fit threaded type batteries including those with metric threads. Note- the items listed on this page are the adapters only. The battery cap itself is not included and must be purchased separately. Click here to view our battery caps.

Battery Vent Adapter #4D-8D-SIA

  • Fits 4D or 8D Batteries with Screw-in Caps
  • Converts 3/4″ Diameter Threaded Batteries to Accept 1/4-turn Bayonet Caps
  • Screw-in Style with Rubber Seal (Included)

Click here to view this item in the online store.

Battery Vent Adapter #4D-8D-PIA

  • Fits 4D or 8D Batteries with Push-in Caps
  • Convert 3/4" Diameter Push-in Style Batteries to Accept 1/4-turn Bayonet Caps
  • Push-in Style (No seal required)
  • Fits All Batteries with 3/4 Inch Diameter Vent Holes

Dress up your car's engine compartment! This battery vent adapter lets you replace the original plate style vents that cover all three holes with our yellow, red, blue, orange, black, or white battery caps. This vent adapter fits 3/4 inch diameter vent holes. Please measure your battery before ordering. Click here to view this item in the online store.

Battery Vent Adapter #M22X1.5

  • Converts M22x1.5 Threaded Batteries to Accept 1/4-turn Bayonet Caps
  • Screw-in Style with Rubber O-ring Seal (Included)

Click here to view this item in the online store.

Battery Vent Cap Adapter #M27X3-SIA

  • Converts M27x3 Threaded Hole to Accept 1/4-turn Bayonet Caps
  • Screw-in Style with Rubber Seal (Included)

Click here to view this item in the online store.

Battery Vent Cap Adapter #1050VCA

  • Fits European Push-in Style Batteries
  • Fits some Batteries Manufactured by Douglas Battery Co.
  • Converts 1-3/8" Diameter Hole to Accept 1/4-turn Bayonet Caps
  • Push-in Style with Rubber O-ring Seal (Included)

Click here to view this item in the online store.