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Brake bleed nipple o rings compatibility: compatible with Moto V2, compatible with Mono Mini, compatible with Tech V2; confirm ID 4 mm x CS 1.5 mm matches your bleed nipple to ensure proper sealing during service. Hydraulic brake seal function: provides a tight interface at the bleed nipple to help limit fluid seepage while bleeding; supports consistent lever feel for road and mountain bicycles during routine maintenance. Rubber construction details: black rubber sized at inner diameter 4 mm with 1.5 mm cross section; compact profile fits small fittings and is easy to carry as spares in a home tool kit or professional shop. Bike maintenance uses: ideal for periodic brake bleeds, replacing worn seals, and building a backup service kit; practical for workshop jobs, at home repairs, and quick roadside or trail support when needed. Installation and quantity: slide an o ring onto the bleed nipple before opening the system; set includes 20 pieces to support multiple services or fleet upkeep across several bicycles over an extended period.