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4 Bolt with 2x socket head sideways coupling bolts
The 2 Boston valves have different thread patterns
Manual choke (cable actuated - hand controlled) for precise cold start control
Riser Gasket suit PCM 409 ZR6
Mercruiser Pump Kit MR Alpha 1 Sierra 18-3320 4528-0001 4 Bolt with 2x socketKit Contains: (1) 18 3109 Water Tube replaces O. E.# 23 29804(1) 18 3017 Impeller replaces O. E.# 47 89984(1) 18 3116 Housing replaces O. E.# 46 96148A1(1) 18 3420 Water Pump Base replaces O. E.# 46 44292A3(1) 18 2919 Water Pump Base to Gear Housing Gasket replaces O. E.# 27 42631 1(1)18 3110 Grommet replaces O. E.# 26 38970 (2) 18 2945 Gear Housing Drain Screw Gasket replaces O. E.# 12 19183(1) 18 2826 Water Pump Base to Gear Housing Gasket replaces
