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I am also confused.
I have not known Ipsco to manufacture a OEM replacement thermostat restriction plate. The only offering from IPSCO is the total block off plate you found.
if Sharky is using the total block off plate I think now is the time for him to step in and explain why he is deviating from the OEM cooling system design. 🤷♂️🤷♂️
Tim Meyer is the current and reliable supplier of his OEM-design restrictor plates and the correct high flow Cleveland thermostat
Larry