Pin holes in a Delta faucet spout are usually caused by "dezincification," which is the removal of zinc from the brass due to salt solutions, brackish water, mildly acidic solutions and poorly grounded plumbing systems. When the zinc is removed, the copper is redeposited to these areas and the surface of the part. The redeposited copper is a weak mass that is porous and fragile.

If this has happened, you will need to replace the spout. To determine the spout part number for your faucet model, contact your Delta plumber or showroom, or e-mail us.