262 is a threaded hole nut screw bolt spring lever mechanism solenoid ratchet gear shim elongate member threaded member or other device configured to be controllably change and or maintain the position of the adjustable member 260 in one embodiment the adjustable member 260 is configured to be readily accessible for servicing without removing or disassembling the fenestration product 10 in one embodiment the adjustable member base 262 is configured to be readily accessible for servicing without removing or disassembling the fenestration product 10 in one embodiment the first wall channel surface 222 includes one two three four or more adjustable member interfaces 264 in one embodiment an adjustable member interface 264 extends along a body length 213 of body 210 see fig1 in various embodiments an adjustable member interface 264 is configured to connect the base 210 to an adjustable member 260 and or an adjustable member base 262 through unitary construction separate movable parts welding bonding attaching adhering permanently attaching temporarily attaching or some other type of interface in one embodiment the drainage system 200 is configured to conceal contain and or route wires connectors cables optical cables lights sensors alarms or other apparatus in proximity to a fenestration product 10 as illustrated in fig2 6 in accordance with various embodiments of drainage systems 200 one or more drainage systems 200 includes can be used with one or more fenestration products 10 fig2 illustrates a flush configuration drainage system 200 according to an embodiment of the present invention in which a cover 280 is configured to be substantially flush with an interior floor surface 6 an exterior floor surface 7 or both in one embodiment.