Configurable modular sleeve valve

A system of configurable fluid plumbing, the system comprising:

• a planar surface including a first junction-hole, a second junction-hole, and a first trench in the planar surface connecting the first junction hole to the second junction hole;
• a first modular sleeve valve in the first junction hole;
• and
• a second modular sleeve valve in the second junction hole, the first and second modular sleeve valves including:
• a valve body including a first port on a first sidewall of the valve body and a second port on a second sidewall of the valve body;
• a first valve core sleeved within the valve body, the first valve core a cylinder including a first aperture in a cylindrical sidewall of the first valve core and a second aperture in a top base-wall of the first valve core, the cylindrical sidewall defining a first space within the first valve core, the first valve core removable from the valve body and radially rotatable within the valve body;
• and
• a second valve core sleeved within the valve body, the second valve core a cylinder including a third aperture in a cylindrical sidewall of the second valve core and a fourth aperture in a bottom base-wall of the second valve core, the cylindrical sidewall of the second valve core defining a second space within the second valve core, the second valve core removable from the valve body and radially rotatable within the valve body, the second valve core positioned stacked upon the first valve core to align the second aperture and the fourth aperture to create a combined space from the first and second spaces;
• and
• a first pipe positioned in the first trench and connecting the first port of the first modular sleeve valve to the first port of the second modular sleeve valve.