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Quantity
1
Flushing your Mercury outboard shouldn’t feel like a wrestling match — but if you’ve ever struggled with that impossible factory flush port cap, you know it often does.
Even on brand-new engines, removing the OEM cap is frustrating. It's we...
Reviews
4.7
18 ratings
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It definitely makes flushing a Mercury 300R easier
Great product! It definitely makes flushing a Mercury 300R easier. The design is excellent. The install is really tricky. It isn't as easy as the installation video makes it seem. You have to shorten the factory hose buy cutting some off or it kinks. After you cut some hose off, it is short and extremely difficult to get onto their fitting and back in place.
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Anonymous · April 15, 2026
Excellent product makes regular flushing much easier. Part that connects to engine takes a bit to get threads properly lined up on Merc 200. Be patient