Gazza I know how you feel, who ever has that sig, "thats funny I don't remember being absent minded" they have my vote for class comedian.

We have a 3md but it definitely has two plastic plugs in holes......sorry, know that doesn't help much... :lol:

Awwww, Deb. I read Gazza,s post and said "ah-ha", perhaps thats it. Then I read yours and back to the same problem. :lol:

How old is yours Deb. Perhaps the newer or older models are as Gazza describes. Also you mention yours is a 3MD. Is that the same model as mine of the 3MDQX-SC, which is a higher flow, lower head model. It would have 1in. in and out. Mine is 3/4 in and 1/2 out.

Doug, they are great pumps. Run for ever. Parts are easy to buy. I know they can even be repaired in Winnipeg. I only like the fan cooled models. I am also a huge fan of the Mak 4 pumps. Excellent pumps and fan cooled. Quieter than my 3 MD.

Yes, it is that exact model, however it is four years old so that could be it all right.

see attached link. the blue arrows point to the oil holes
http://www3.telus.net/beaker/lg3mdqx.jpg

:D Thanks beaker. Thats the type of hole I have just above the power cord exit. I assumed it may be the oil hole, but needed some confirmation. I seem to have just the one though. Guess its all the new models have.

How much oil are you putting in these pumps, and how often?

Your supposed to put a few drops in every 6 months.