The Minimatic 4/B unloader and by-pass valves are designed specifically to fit the XT and XM series of triplex plunger pumps from Annovi Reverberi. Here you will find all the parts you will need to repair a damaged or worn out unloader.
You can find a parts breakdown diagram for the Minimatic 4/B Unloader here.
For replacement orings and back-up rings, see kit IPF AR2812. It contains all the orings and back-up rings common to all versions of the Minimatic 4/B unloader.
For replacement mounting bolts, see kit IPF AR2572. It contains the hardware needed to mount an unloader to your pump, including the bolts and the orings.
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