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The GEMÜ 653 / 654 manually operated 2/2-way metal diaphragm valve has a stainless steel bonnet and is available in two versions - GEMÜ 653 has a handwheel in high temperature and chemically resistant plastic, GEMÜ 654 a stainless steel handwheel.
The handwheel is non-rising (except diaphragm size 8) and has a standard optical position indicator.