Call Equal at 1-800-233-7086. They sent me a sac full of new Schrader valves (valve cores) for free (with the screens in them). I even got a "Equal" hat with the valves
I've used Equal for three years now-- No problems, and a smooth ride.
2002 Newmar Mountain Aire, 37', 3778, W-22, 8.1 Vortac, Ultra Power upgrade, CAI (cold air intake), Taylor wires, colder plugs, Koni shocks.