Fully depressurize machine.
Remove 2 bolts from bottom of machine.
Remove 2 “ears” from bottom of machine.
Remove air inlet jet (looks like a pilgrim hat).
Push casting and air hose out of the way.
Flush out inside of equipment with water.
Once media and water are out of machine, reverse procedure:
Put gasket on air inlet jet.
Insert air inlet jet and gasket.
Hold casting up to bottom of machine.
Use ears and bolts to re-secure casting.