3.0L Exhaust Riser Restrictor Plate | Volvo 3853628 Exhaust water restrictor plate for various Volvo Penta 3.0L 4 cylinder marine engines to control manifold cooling water flow. Stainless steel elbow exhaust water restrictor plate For Volvo Penta 3.0 GLP, GLM, GSM, and GSP model engines Gasket P/N 3850495 – sold separately Replaces OMC / BRP 3853628 Replaces Volvo Penta 853628 Original Volvo Penta