Digi-Key has a few different products that can control various liquids. We have solenoids, which can be used to stop various liquids and some gasses. These act as a gate for the various materials they are used for. The different options we have are located here https://www.digikey.com/short/zh4rhz . Applications for these devices could be anything from controlling cooling systems on machines to controlling a watering system for a garden.
These devices are available with various sized threaded input and output connectors to connect to different piping or hoses.
If you are needing a precise measurement of liquid dispensed, Digi-Key also carries peristaltic pumps that are made for dispensing liquids or other various fluids. These can be used in several different applications because the fluid that is being dispensed is confined to the tubing and the pump itself cannot contaminate the fluid. Some of the various applications that these are used in drink dispensing, transfer of fuels or lubricants, or even some medical applications such as pumping IV fluids. Here is a list of these devices that we currently have in the system https://www.digikey.com/short/zhmfqn
If consistency is not needed and you are looking at transferring liquids, we do have a few other options that can accomplish that. We carry vacuum pumps and submersible pumps. These have a range of applications from automotive pumps to fountain pumps or even for bilge pumps for watercraft. Here is a link to those options https://www.digikey.com/short/zhmf4b