The 1-3/8” Centralizer Pump Down Mandrel is designed to pump tool strings to depth in horizontal or deviated wells using a flexible pumpdown bag and fluid being pumped from surface. The mandrels can be expanded according to size of casing or tubing and will collapse when pumping through a restriction. They will then re-expand to the set diameter after passing through the restriction to continue the pump down operation. This setup is compatible with 2-3/8” tubing up to 9-5/8” casing by just simply changing the size of bag installed on the mandrel.