c to stabilize the flow control member and aid assembly the housing base 38 includes a center cylindrical support member 70 within bore 46 when assembled the support member extends through the center of the flow control member 48 the upper end of the support member 70 is tapered at 72 to engage a matching internal taper 74 in the flow control member to assist in assembly and centering alignment the outside diameter of the support member 70 is smaller than the inside diameter of flow control member 48 and as a result an annular flow path 76 in the form of an annular region or gap is defined between them in the illustrated orientation this flow path 76 extends axially or vertically between the support member 70 and flow control member 48 through each of the horizontal regions or planes 14 14 through 17 17 thus fluid flowing through any of the apertures in planes 15 15 through 17 17 is combined in and conducted through the flow path 76 defined between support member and flow control member and directed to aperture 62 in plane 14 14 the outer diameter of the support member 70 and inside diameter of the control member 48 are preferably sized to provide several desired benefits one such benefit is.