Heidolph Synthesis 1 - Manual (Page 83)

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4.4.3 Connect vacuum and coolant
Slip special union ring over PTFE vacuum hose as shown (this special union ring is
not identical to coolant caps !). Slip sealing ring in place and plug hose in vacuum
fitting. Fit special union ring and pull hand tight.
4.4.4 Install receiving flask
Secure receiving flask on cooler with special clamp.
vacuum
fitting
coolant
fitting
sealing ring
special union
ring
PTFE vacuum
tube
receiving flask special
clamp