Allen socket head drain plugs with captive seals combine a hex-recess drive with an integrated sealing washer that stays in place during removal and reinstallation. Designed for parallel-thread tapped holes, the captive seal eliminates the need for a separate gasket and reduces the risk of dropped or lost components during service. Available in multiple materials and thread sizes, these plugs provide reliable, long-term leak prevention in oil, coolant, and hydraulic service points.
