Maestrini Bronze Reducing Bush (4" BSP Male to 3" BSP Female) proboat WDS Tie Bar System Another option is an empty

Another option is an empty panel to make another non-standard configuration

even with a low engine rpm

Stern Tube: 3" to 3-1/8"

Motor life approx 100 hours

25HP E25EEDM 1996 Fuel Hose & Primer Bulb - 5/16 IN

Maestrini Bronze Reducing Bush (4" BSP Male to 3" BSP Female) proboat WDS Tie Bar System Another option is an emptyThe Maestrini reducing bush adaptor is made from bronze. This material is tough and corrosion resistant making it suitable for exposure to sea water. This bush fitting adapts a 4" BSP male connection to a 3" BSP female connection. Please Note: All fittings used for through hull applications must be correctly electrically bonded to ensure protection from electrolytic corrosion. Bronze is highly suitable for below waterline through hull applications.