The Protium Quad Port Reservoir Cap comes included with all Protium Reservoirs and the Protium Ultimate 150 D5/Reservoir Combo. It is available separately as an add-on or replacement part to reconfigure existing products or create your own custom version. This cap can be used on the top or bottom of your reservoir or on both ends as inlet or outlet. The extra ports and 90 degree ports allow a large variety of options to reduce fittings and to make building your loop easier. An inlet tube is recommended on all inlets to eliminate air recirculation.Specifications:Protium Frosted Acrylic CNC Machined Quad G1/4 BSPP Port Reservoir Cap 90 Degree.