Manifold assembly and manifold

A manifold assembly, comprising:

• a liquid inlet pipe, having a first accommodating space, a first liquid inlet, a plurality of first liquid outlets and a plurality of openings, wherein the first accommodating space is configured to accommodate a cooling liquid, the first accommodating space is in fluid communication with the first liquid inlet, the plurality of first liquid outlets and the plurality of openings, and the plurality of first liquid outlets are configured to be in fluid communication with at least one server;
• a plurality of transparent windows, covering the plurality of openings, wherein the cooling liquid is visible from outside via the plurality of transparent windows;
• and
• a liquid return pipe, having a second accommodating space, a plurality of second liquid inlets and a second liquid outlet, wherein the second accommodating space is configured to accommodate a cooling liquid, the second accommodating space is in fluid communication with the plurality of second liquid inlets and the second liquid outlet, and the plurality of second liquid inlets are configured to be in fluid communication with the at least one server.