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J-kem digital vacuum regulator model DVR200
J-KEM Digital Vacuum Regulator Model DVR200 Working! List $1175.00
The DVR-200 is designed for vacuum systems that run continuously, such as oil-filled vacuum pumps, aspirators, or with systems that are "always on", like in-house vacuum systems. When the DVR-200 is connected between a vacuum source and a piece of equipment, the vacuum valve inside the DVR opens and closes so as to regulate pressure inside the attached piece of equipment to within 1 mmHg.
Mfg info: http:// /dvr.html