Waterco 50mm Multi Port Valve Sight Glass TM & SM Valve
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Sight Glass For 50mm Waterco Valve TM and SM Plus most other Waterco Filter Valves
Waterco 50MM Multiport Valve Sight Glass TM
There were two 50MM valves Manufactured at that time, One valve had all English instructions with the part number 621381. The Other Valve had instructions in both English and European. Part Number 62138 The MPV with Multilingual instructions was manufactured prior to 2007.