Used Lot of 6x Ohmeda Intermittent Suction Unit & 2x Ohio Intermittent 1251

Used Lot of 6x Ohmeda Intermittent Suction Unit & 2x Ohio Intermittent 1251 Used units.  I am unsure how these work, but they all seem to be in decent condition.  One of the Ohio Intermittent Suction Unit Model 1251 glass is popping off.  light cosmetic damage/wear on the items The Ohmeda Intermittent Suction Unit (ISU) Model 1251 is a dual-mode medical vacuum regulator designed for hospital pipeline systems to provide precise continuous and intermittent suction. It features adjustable timing cycles, a color-coded gauge, and a negative pressure range of 0 to 200 mmHg Key Technical Specifications ​Pressure Range: 0 to 200 mmHg negative pressure ​Flow Rates: 0–13 LPM (intermittent) and 0–80 LPM (continuous) ​Timing Cycles: 3 to 30 seconds, with independently adjustable ON and OFF times ​Gauge Accuracy: ± 10 mmHg or ± 5% full scale deflection Operational Modes ​Intermittent Mode: Used primarily for nasogastric (NG) drainage. ​Continuous Mode: Applied during tracheal, pharyngeal, or general surgical suctioning.  Design Features ​Color-Coded Gauge: Displays low (green), medium (yellow), high (orange), and full vacuum (red) zones. ​Pneumatic Operation: Utilizes a pneumatic Unilogic module for reliable cycling. ​Connection Types: Built with standard hospital wall adapters like the Avante Health Solutions Ohmeda diamond adapter and a front patient tubing nipple.