SC Protium 1.0 Triple Port Cap – Frosted Acrylic RBAC-000-60 The Singularity Computers Protium Triple port cap for all Protium reservoirs. The 3 ports can be used as inlets at the top of your reservoir, or you can also move the cap to the bottom and use them as outlets. An inlet tube is recommended on all reservoir caps. Specifications: Triple Port Cap: Black Acetal or Polished Clear Cast Acrylic or Frosted Clear Cast Acrylic. CNC Machined. Weight: 0.025KG. Dimensions: 57mm x 11mm Installation: Compatible with Protium 1.0 Reservoirs and D5 Reservoir Combos.