Mercury Coupling Insert, Garden Hose Flush Adapter (22-857175) Flush the cylinder block with fresh water the OEM-correct way. The Mercury 22-857175 coupling insert adapts a standard garden hose to the factory coastal flush port on the front of the engine, making routine post-run rinses fast, clean, and effective. Applications Optimax 75 HP and above, approximately 2004–present Mercury Saltwater model outboards with the front coastal flush port Other compatible models equipped with the Mercury coastal flush kit (verify by serial/model) Shipping & Returns Fast shipping from Wisconsin with reliable carriers. Need help confirming fit by model/serial? We’re happy to assist. Returns are easy—see our Return Policy. Key Facts Brand: Mercury / MerCruiser Part #: 22-857175 (Coupling Insert) Function: Adapts a standard garden hose to the engine’s coastal flush port for fresh-water flushing Works With: 22-857176 (Coupling Body); 858566A02 (Coastal Flush Kit), as applicable Install: Hand-thread into the port; connect hose; follow owner’s manual flush procedure Notes: Do not substitute non-OEM fittings; confirm compatibility by engine serial number What’s Included 1 × Mercury coupling insert (22-857175) Service Notes Consult your owner’s/service manual for engine-specific flushing steps and whether the engine should be off or idling during flush Use fresh water only; flush promptly after salt or brackish use Inspect the flush port seal and threads; replace worn components to prevent leaks After flushing, disconnect, drain residual water, and reinstall the protective cap (if equipped)
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