After searching high and low, we've managed to acquire a good supply of these oft-requested Asco/Joucomatic 4-way valves at a great price. These are the series 518 valves with machined exhaust 'slots' rather than tapped ports (the input and outputs are still tapped for M3 threads, though). They draw about twice the power of a standard Humphrey or Skinner valve, so make sure your board can handle the higher current requirements. Solenoid has a 5vdc coil, and leads are bare with no connector attached.
These solenoids come with no warranty - they are brand new and unused, but due to the pressures and cycle rates that many guns subject the valves to, most solenoid manufacturers refuse to honor warranties when their products are used in paintball applications. As such, we are unable to offer warranties when the manufacturers won't.