Each Comatrol cartridge valve is mated to a Comatrol standard cartridge hole. These cartridges are designed to SAE standards or metric standards. In many cases, these cartridges are interchangeable with cartridges made by other manufacturers.
The National Fluid Power Association (NFPA) and the International Standards Organization (ISO) are developing a standard, NFPA T3.5.31M-19XX, that will define an industry-wide standard for mating holes. Comatrol will manufacture cartridge valves for NFPA cartridges through the formal adoption of this standard.

Custom manifolds will be designed to meet your circuit requirements.