Whale Tail Hydrofoil Stabilizer – Fits Outboard & Sterndrive 40-300 HP Engines (Replaces FO2003) 4.4HP What is the purpose of

What is the purpose of the internal flaps in the exhaust bellows

and GLM 12091

it utilizes water pressure to expand and dislodge blockages in sinks

How do these compare to the SE Sport 300

Whale Tail Hydrofoil Stabilizer – Fits Outboard & Sterndrive 40-300 HP Engines (Replaces FO2003) 4.4HP What is the purpose ofProduct Details This Whale Tail Hydrofoil Stabilizer is designed for universal application on most outboard and sterndrive engines rated from 40 to 300 HP. It improves planing speed, reduces porpoising and cavitation, and enhances overall fuel efficiency for a better boating experience. This part is a direct cross reference for several part numbers, including UANOFCN FO2003, NorthBoat FO2003, SupremeMarine FO2003, and Marine Sport 300. Installation