Abstract: A valve seat member (18) presenting a valve seat surface (20) at one end against which an associated valve (16) seals. A valve stem guide (36) is supported in a central flow passage (34) of the valve seat member (18) by two diametrically opposed arms (38). An annular abutment surface (44) extends radially into the flow passage (34) and is spaced axially below the valve seat surface (20) and above the arms (38) for providing a ledge with which a removal tool (42) engages to extract the valve seat member (18) from a slush pump deck (12). The associated valve (16) includes a valve body (72) having a shape defined by a segment of a sphere centered at the apex (70) of a cone (68) which simultaneously defines the shape of a peripheral sealing face (74) of the valve body (72) and the shape of the valve seat surface (20).