They are probably 1/4" pipe thread. Take one of the plugs if you have it to
the local auto parts store. They carry a selection of brass plugs.
Bill

"John H" wrote in message
...
On Sat, 9 Apr 2005 20:00:28 -0400, "M.E."
wrote:

I am looking for new drain plugs (3 of them) they all appear the same and
look to be 3/8" diameter thread and are a 7/16" head... they are for a
'77
mercruiser 140HP 181 engine. I am looking for atleast a part number for
them or something simular or if they are something easy to get somewhere
other then my local marine shop that wants $14ea for them and wont give
me a
part number

Thanks in advance.

Mike

You might try he

http://www.mercurypartsexpress.com/P...phome.asp?CID=

but you have to know the serial number of the engine.
--
John H

"All decisions are the result of binary thinking."