Keep your battery watering system running leak-free. These genuine Flow-Rite replacement O-rings are precision-matched to the BA-QDV-500 and BA-QDV-505 male quick couplers -- the most common couplers in Flow-Rite single-point and multi-cell battery watering systems used across RV house banks, golf carts, floor equipment, and marine deep-cycle setups.
A worn or cracked O-ring in a male quick coupler is one of the most common causes of electrolyte drips and inconsistent fill levels in a battery watering system. The BD-00204-10 provides a direct, drop-in replacement seal that fully seats into the coupler groove and restores a reliable, leak-resistant connection every time the coupler is attached to the fill port.
Sold as a pack of 10, this kit gives you enough spares to service an entire battery bank or keep extras on hand for future maintenance cycles. Replacement takes seconds -- no tools required. Simply remove the old O-ring from the coupler groove and press the new one fully into place before reconnecting.
Dimensionally matched to BA-QDV-500 and BA-QDV-505 couplers. No trimming or adapting needed.
Service a full battery bank or stock spares for the road. Ten O-rings per package.
Formulated to resist degradation from dilute sulfuric acid electrolyte in flooded lead-acid batteries.
Remove old O-ring, seat new one in the groove -- done. No special tools or disassembly required.
These O-rings are designed specifically for the following Flow-Rite male quick coupler assemblies:
These couplers appear in Flow-Rite Pro-Fill and EZ-Fill battery watering systems commonly installed on 6V and 12V flooded lead-acid (FLA) batteries in RV house banks, golf cart packs, industrial floor equipment, and marine trolling motor banks. If your watering system uses a different Flow-Rite coupler model, verify the part number on your coupler body before ordering.
Electrolyte exposure, UV light, and repeated connect/disconnect cycles gradually degrade rubber O-rings. A degraded seal allows water or electrolyte to bypass the coupler during filling, leading to uneven cell water levels, overflow onto battery tops, and potential corrosion of terminals and trays. Replacing O-rings at least once per season -- or any time you notice moisture at the coupler joint -- keeps your battery bank in optimal condition.