Are all faucet connectors the same?

Valve and Faucet Fittings Shut-off valves come with different-sized outlet ports. The two most common are 3/8- and 1/2-inch compression or male pipe thread. Faucets connectors arent completely standardized, but most have 1/2-inch male pipe thread connectors.

What are faucet adapters?

A faucet adapter is a very small and simple piece of equipment that, believe it or not, can make a huge difference in homebrewing. It is designed for one purpose, which is to allow the attachment of garden hose threads (GHT) to a standard kitchen faucet.

Why are there 3 water lines under sink?

The first pipe brings cold water into the faucet. The second pipe bring cold water from the faucet into the water heater. The third pipe brings warm water from the heater back to the faucet.