MAP sensor check valves - HELP

I am having problem setting up the check valves with the map sensor, could someone please explain to me how they are suppose to be set-up. I have already blew out the diaphram in the shitty "tetra" check valves and want to be sure I have it hooked up right. If anybody can give me any insight to how it is really suppose to be and/or look it would be much appreciated. BTW where can I get stronger check valves?

read this.

http://www.thedropshop.tv/vafc.htm


depending on your setup this may sway you from check valves.