Metal Pipe-FlowThe Metal Pipe Flow P 1 (for outflow) has a movable outflow nozzle that can be moved left and right to create a water flow that matches the layout. The Metal Pipe Flow V 1 V 2 (for inflow) has a removable end cap for easy maintenance. The simple yet sharp design of the Metal Pipe Flow creates a new flow in Nature Aquariums. Article Code Type Pipe diameter (mm) Height (mm) Inside dimension of bent pipe section (mm) 105 123 P 1 13 140 54 105 113 V 1 13