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Notes: 1G HTSL has two Upchurch 6-way, 7-port valves with 6-32 fittings. These are obsolete valves with no direct replacement. Protasis offers a trade-in credit toward a new, 2nd-Generation HTSL with a new, multi-protocol dual-pump controller, a new Sapphire 250uL pump and two new, 'smart' Rheodyne Titan valves. The Titan valves include an optical encoder to confirm position. Titan valve 'pods' are held in place with a simple, manual collar to allow easy and rapid field replacement. Valve rotor may be replaced by disassembling the valve pod.