This is Graeme Martins mono water drains. We lost pics of our N4211s in a computer crash.
We modified our drain/filter screens as follows:
*Lengthened screens by about 50%
*Used finer mesh Stainless screen
*Turned two Aluminium spacers, one mid span and one on end
*Reduxed spacers to copper drain
*Safety wired screen to spacers
*Reduxed screen to outlet fitting
Y10-05-06