I got the unit from Wagga tractors.

I have pulled the unit to pieces and cleaned it. Lubricated the seals with oil and reassembled. The housing and bowl do not move when i try to rotate them.

I am not following the idea about the pipe nut, this unit has a bolt which goes into an ally rod which is threaded on the end. This threaded end goes into the ally drain cock assbly which locates through the bottom of the glass bowl. I cannot see how this bottom part could be adjusted as it is a one piece component except for the plastic drain plug?

I will test it tonight and see how it goes. hopefully the oil on the seals will make the difference. Thanks for the assistance

Sam