Water Pipe Under Sink

Keeney 1 1 4 in brass sink trap j bend.
Water pipe under sink. What is the common water line size under a sink. This video shows how to assemble drain pipes under a sink. Standard sink supply line size. When you see water on the bottom of the cabinet under the kitchen sink it means a pipe or a pipe connection is leaking.
The copper galvanized steel or pex pipes that constitute a residential water supply. For pricing and availability. Things needed 1 gallon plastic bucket large adjustable pliers ring nuts optional nylon drain washers optional. The first question to ask is which one the water could be coming from the sink drain or one of the faucet water supply hoses and if you have a dishwasher it could be coming from the dishwasher drain hose.
Keeney 1 1 2 in dia pvc p trap fitting. Under sink water supply line types.