For either F2 or JACK. Valves were sourced from a retailer after they were discovered unpackaged in storage. With no history on the valves these valves were given away, and refurbished by myself. All valves fire tested as normal, with no detectable leaks down to 5ml/min. Essentially brand new, but being sold as used since their history is unknown. Valves will come bagged, and are clean and free of any debris. May work in GATE Pulsar systems. Same model though it has not been confirmed the electronic specs are the same.