Napa has the right size for the check valve closest to the solenoid on firewall. I used the bigger black check valve from napa for the others. It has three outlets so I just plugged one with a vac plug.
06' F-150 FX4 5.4L 3:73L.S. Scab
2" Autospring LK
305/70R18 procomp xtreme m/t
5% tinted front windows
double 20% tinted rear windows