This Valve Brush is at a 45° angle and features (2) 1/4” OD tube inlets.  An end plug installed in one of the inlets can be removed to connect brushes in a series.  An adjustable precision needle valve controls the flow rate; it has a friction lock to guard against loosening from vibration.  The holder has (2) 7/32" dia holes for mounting.  The bristles are nylon (stainless steel is also availble, part no. B310-1X01).  The total width of the brush is 2 ¼”. 

The shank is adjustable to accommodate up to 1/2” of bristle wear.  A replacement brush that slides into the holder is readily available.