Description
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)