Brand: MERCURY MARINE
Mercury P/N: 866004A01
Only required on sterndrive engines that have the exhaust going through the prop.
Fits MCM V‑8 (305, 350 & 377 cid) engines with 3 in. (76 mm) risers (s/n
0W310000 and up).
If you are unsure of the application, please enter the make, model and serial number information in the comments section of the checkout.