These are the plastic dome covers that fit on human anesthesia machine absorbers from Ohio - Ohmeda (absorber 18, 19, 20, 21) and on veterinary anesthesia machines from Pitman-Moore (models 960, 970, 980. 990). These fit over the little white or black flutter valves that move up/down as your patient breathes.
Please note: in two of the pictures we used a paper clip to elevate the part to give you a better angle on it's size/shape.
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Branton Vet Anesthesia Service
2109 Teakwood Trace
Fort Worth, TX 76112
817-919-2285