manifold drain plugs

moparlvr4406

Active Member
Jun 29, 2011
4,462
Lake Monroe Indiana Fourwinds H31
Boat Info
1985 340DA
1966 SRV180
(2)1960 Sea Ray 600
(2) 1963 808 Cruise-a-bouts
Engines
twin 350hp Crusaders 4.0 Onan /
Merc 950 SS
Merc 650
Merc 1100
twin Johnson 40
Did my winterizarion today and found one oddity
my stb manifold has 3 drains but the port has only 1
why would this be ??
 

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