Remote battery watering system lets you fill all batteries to proper electrolyte levels from a single fill tube, using a simple hand pump. Safer and more accurate than conventional filling. Installs in minutes without tools. Sends water only to low cells without overfilling! Works with any distilled water container. Fits all 12V flooded lead acid batteries in group sizes 24 through 31 with standard 3-cell and spacing of 1-5/8" center-to-center. Includes 4 manifolds(enough for two 12V batteries) 4' of tubing, quick connect and dust cap. Priced each. Requires RV-2020 hand pump (sold separately) for operation.