thank you to Jon, Charlie, Oren, Bob. The extra pipe is 4 feet above
ground, same level as cold water inlet and hot water inlet faucet. It
is located exactly between cold and hot, same pipe size as cold and
hot, but without faucet, just a pipe stick out perpendicular to the
wall. It could be anti-hammer, it could be for water softener. My
washer I am trying to connect have only cold and hot water hoses and
drain. What do I need to do about this pipe? Leave it alone? connect
it to something? to what? One possibility is to have a rubber hose
and a screw clamp direct it to the drain?