This Valve Brush features a shank with (2) 1/8” female NPT inlets.  The 1/2”–20 threaded shank can be secured to a mounting bracket using the plated steel nut and washer.  A pipe 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 shank is adjustable to accommodate up to ½” of bristle wear.  The bristles are nylon (stainless steel is also available, part no. A2261-SR1BHW).  The total height of the brush is 6 5/16”. 

A replacement brush is readily available.