i can't say that i like this much, creating a product to confuse an already unnecessarily complicated situation. www.tmeyerinc.com now owns the tooling for the hat on the sensor bulb, that's why Flowcooler has omitted it and produced the restrictor to fit the bare thermo sensor. they just have to get their slice of the pie. seems simple enough though, as it could've been done from the beginning except that the fit is absolutely too tight IMO. no way i would install that as-is w/o first clearancing the orifice to prevent it from grabbing the sensor. also, Derk https://www.facebook.com/DerkBrocxWaterpumps/ says his testing shows that blocking the bypass completely stalls the pump. i have a feeling starving the pump invites cavitation?
where was Flowcooler when all we needed was a supply of restrictor plates?
factory correct hatted MOTORAD Failsafe thermos are available from Rockauto for $5.07