Threadolets are welded fittings for Steel Pipe. There is no Plastic equivalent I am aware of.

On PVC pipe Service saddles are most often used
They don’t tell us if it is Sch’d pipe or Class pipe sizes.

Badger Meter does not sell Service Saddles, but one source of these saddles is Cascade Water Works.
http://www.cascademfg.com/tappingSleeves.aspx


If it was Sch40, or Sch80 pipe they would order a Model  CTT-4.5-2”I.P.

 


The pressure rating of the 220P Series is 100 PSI as shown in the Owner’s Manual, and starts to de-rate at 25°C down to 40 PSI at 60°C
http://www.badgermeter.com/Industrial/Impeller-Products/Sensors/PVC-Tee/872022-228P-Series-Plastic-Tee-Type-Flow-Sensor-IO.aspx

 

The pressure rating of the IR220B with a Saddle would be limited by the pressure rating of the Saddle, which if using the CCT saddle above would be 250 PSI