I think you are referring to a Jandy valve. The valve diverts water from the main drain to the skimmers. When vacuuming, turn the valve so it is pointing to the skimmer inlet pipe.
OR
It could also be called a diverter valve located at the bottom of the skimmer depending on the age of the skimmer.
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it is used to interface between controller and peripheral device.. peripheral device otherwise called external device such as LED,LCD...
Hooter is an alternate name for buzzer or alarm device.
The communication between input and output device is called interfacing.
Voltage drop.
Router or bridge.
added device called networking
A card skimmer reads the back of credit and debit cards. It is a type of device employed to commit credit card fraud and identity theft.
SlingBox Pro software is used to stream TV to your TV sets and provides a go-between between up to 2 unique media devices. It allows them to individually communicate with the Output device, (a TV), and you can alternate between both devices.
A Protein skimmer is a device that take out protein from the water. Meaning, it takes out desolved solid wastes. The ocean has it's own protein skimmer built in: waves hitting the beach. In some more polluted areas you can literally see all the bubbles along the shore or beach. For a reef tank you must have one. For just a fish tank, it is highly recommended to have one.
A serverThe device that manages trafic between two networks is a router.
A card skimmer is a device used to steal credit card information. It is placed over the card slot in an ATM machine where it will read the magnetic strip of credit cards as they pass into the ATM. It will then usually keep a record of cardholder information until the criminal returns to the ATM to remove it and recover the data.
modem