Alternative to R-Speed valve

[lpcapital]

It looks like the "R-speed" check valve suggested by Shawn on here is no longer available. I also did some modification (I'll soon post some pix) to the air shroud going from the intake to the injector valves: I basically connected the injectors in series with a bunch of tees and I'm running a 5/16" hose all the way to intake. This way I can hide the hose between the block and the firewall as opposed to have it run across the SC.

I decided I'm gonna give a try to this one. It's also considerable cheaper than the R-Speed. The various pressure and vacuum ratings are within the engine environment so it should work just fine.