Battery Filler; Qwik-Fill (TM); Use To Fill Battery Cells With Water; Fits 12 Volt Marine Deep Cycle Batteries Group 24 To 31; Bulb Type; Fills Single Battery From A Single Remote Location With Simple Hand Pump Operation; With Two Manifolds/ 4 Foot Tubing/ Quick Connect/ Dust Cap • One of the primary causes of short battery life is a failure to maintain proper water level. Whether your batteries are in plain sight or hard to reach, adding water to the proper level couldn't be easier with the Qwik-Fill On-board Battery Watering System from Flow-Rite. Compatibility : Fill Battery Cells With Water Type : Bulb Color : Black Is Clearance Item : No Features On-Board Battery Watering System Works With Group Size 24 Through 27 And Most 29 Through 31, 12 Volt Marine Deep Cycle Batteries Limited 3 Year Warranty