Thanks Jonny, doing my best :wink:

''btw, you don't need large tubing on the buffer tank feed.'' come to think of it its not really necessary, you're right - time for ordering parts and start modifying!

I've found this off ebay, looks good for a dump valve - its nice and compact, according to the description in the off position its exhausting. What do you think, is it any good?

Ops forgot the link -here it goes
http://www.ebay.com/itm/PT-3-8-16mm-Mal ... 372wt_1163