Alphacool 18036 MCX Seal Plug 10 pcs Kit - Black

Purpose and fit

This kit supplies ten black sealing caps for the Alphacool MCX manifold system. It is intended for builders who leave one or more manifold ports unused and need a reliable way to close them. The caps keep the loop watertight without requiring a full port count on every graphics card. They suit custom loops that change card layouts over time.

Critical spec

Each plug fits the 6 mm inner-diameter channels used by the MCX series. Compatibility is limited to that specific manifold geometry, so the part will not seal other fitting standards or thread sizes. Buyers must confirm their loop uses the MCX manifold before ordering.

Thermals, noise and power

The plugs are passive metal components with no moving parts, so they add no heat, no noise and no electrical draw to the system. Once installed they simply maintain loop pressure and coolant integrity under normal operating temperatures.