Vacuum Check valves

[fly]

Can you use a smalll diameter green/white check valve in place of a large diameter geen/black one, 2 of the larger valves seem blocked, or maybe they have a higher spring tension?

Any help would be welcome, might finish my car today!

[RobbieRX-7]

i doubt it mate..they are obviously a different size for a reason. I am in the middle of doing my rats nest right now,and i need about 3 small check valves and 1 large.i think you should be able to blow through them 1 way easily, if you cant then they are probably dead!!

[jonrx7uk]

I replaced mine a year ago with cheap plastic check valves from the local motor factors.  Car has run fine since....

Cheers
Jon

[RobbieRX-7]

how much did you pay for them?. i have looked almost everywhere and am having to buy some second hand ones cus i aint no way in this world paying a lousy £25 for some shitty little plastic valve