yeah buddy ^ ^ ^, had i known i would have ordered one of these smc check valves with my kit originally. someone needs to give viAir or Phantom a heads up about this

 

Right?! Except Viair swore up and down to me that it was all my fault they were breaking because they "have great quality control". I explained to them out of the box( or bag...) the check valves were not working but he told me to send them in so they could look at them but he restated "it was probably your fault".

 

I just upgraded my compressors to the dual 444C from the 450C due to check valve issues. But ya luckily I read this thread right before the upgrade. I put a SMC check valve right in front of the Viair check valve just to be safe. One thing I didn't take into consideration is the amperage of the new compressors. They use almost double the power. So I had to upgrade my 4 gauge to a 1 gauge since I'm also adding a couple amps to the rear as well.