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What is the vacuum switch valve (VSV) that is in front of VSV 1,2,3? It has a small diaphragm and a large adjustment screw with 3/8 diameter hoses going into plenum.
Last edited by SisCo; Apr 18, 2023 at 02:41 PM.
Reason: clearer description
Apr 15, 2023 | 01:07 PM
