Description	Models	Information
MK1	MK1	Very basic, two hoses, no wires, no sensors. Solvent tank located under the paper, paper is driven by a cam.
LH Drive	Early GS	Used on GS for 94 and most of 95. No Pinch valve available. Parts are available but be prepared for OEM to get the p/n's wrong the first few times. Motor is the same as used on silver cleaner, but polarity is switched.
Silver	GS, LT, GSX	The most common USC on GS, GSX, LT. Pinch valve was a later addition, initially with a true pinch valve (pinches the hose), and then a fluid shutoff valve. Problem with getting clutch set to correlate paper feed with take up, can cause paper to become wound around the paper feed rod, not easy to remove. Offered sizes: 300, 400, 500mm relatively easy but expensive (~$3K+) to change sizes. Vacuum available as an option, external vacuum only. In most cases vacuum pump voltage cannot be changed.
Blue	GSX, LT, Horizon(All), Infinity	A huge step forward in user friendliness. Direct replacement for a Silver cleaner. Offered sizes: 300, 400, 500mm. <$1000 in parts to change sizes Vacuum available as an option. Internal (ELA / HOZ) or external possible. If vacuum pump is internal, it will dictate the required voltage for the machine.

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