Need some help advice on installing an ingen cold air intake on my 05 base, I'm stuck on capping off the one way check valve connected to the vacuum switching valve, I don't have a one way check valve, my vibe is all stock, so am a bit confused, any help is appreciated

Hey all vibe lovers my name is Steve I own a 2005 and love it looking for advice on how to improve performance and looks thanks guys and gals