22mm Standard Dropper Cap

It is produced with only standard 400 thread with precise dimensional tolerance. It fits tightly while twisting, preventing thread slipping and loose fitting after frequent opening and closing cycles.

Dimension parameters are specially calibrated to match standard Boston round bottle necks perfectly. It is a dedicated closure solution designed exclusively for medium and large-volume Boston bottle packaging projects.

Fitted with an internal sealing liner. Once fully screwed tight, it restricts liquid evaporation and effectively stops leakage during long-distance transportation and long-term shelf storage for essential oils and skincare liquids.