Thanks Canadian Dave for the info that you contributed on my RAD valve survey post. I would like to contact RB Designs. I'm probably not looking in the correct place(might be right under my nose :-) but did a search for 'RB Designs' on Google and DRN and didn't find a readily apparent website or contact information. It has to be close by on this site, since the mod. is referenced so much here. Thanks in advance for the contact info. CD