I just remembered the fact that the water tube connection in #1 working chair had been changed into different way from the originally design, bypassing warmer heater system for emergency measure few years ago. This is why only #1 chair has some stronger water supply for a cup water, reduction of conduit resistance was the reason. All the working chairs had filtering device for water flow in addition that of compressed air, but the systems were removed because of inconvenience, unpredictable filter case fracture on the way of clinical working.
Consequently, all the machinery have to be checked and the treatments of emergency evacuations should be corrected into normal operating condition.
Urethane tube 6-4 in different colors and one touch connectors shown in the picture are prepared as replacement parts.
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