>>There are several other needle valves that appear to be more suited. M3 has one that sounds good for $19. I intend to try one of these on my next system. We have all heard about the Nupro but at $50+ that is definitely not in my budget.<< I just ordered the inline version of this from Ed, ($26) and would be interested in hearing any experience with this valve. Robert Paul H http://www.aquabotanic.com