How to determine which replacement block plugs my engine has?

[Rupp]

Guys,
I've searched high and low and can't find out exactly which engine block drain plugins my Volvo 5.0 GL PEFS has. According to the engine block view at Volvo Pentas site my plugs should be an Allen wrench style but that's not what is in the block. It's a brass plug and I'd like to replace these with new ones but I'm not sure what size to get. Thanks for any suggestions.

 

[Scott Danforth]

1/4 npt in the block, 1/8 npt in the intake manifold and either 1/2 or 3/4 in the exhauat. Stop at your local hardware store and get brass pipe plugs

 

[Rupp]

Thanks Scott. When I replaced the drain plugs today they were all 4 the same size. The ones in the exhaust manifold screwed into a larger adapter if that makes since. So do you think they are all the 1/4 npts?

 

[Scott Danforth]

That would be my first guess