If you search this forum for "pumps valves pipes" you'll find several threads talking about this including http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HFORCEKWTID=70341:5&HOID=5065000000080000005C990000&HExpertOnly=&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0 Several companies sell custom controls. You can see some images at http://www.reichard.com http://www.genlogic.com/widgets.html