Yes. Any sprinkler found to be corroded must be replaced in accordance with Section 220.127.116.11.2. Anytime brass is exposed to constant moisture (particularly combined with chlorine), corrosion will result. Sprinklers exposed to these conditions, should be wax coated to protect the sprinkler from corrosion. Wax coated sprinklers are available from any sprinkler manufacturer. Wax is not permitted to be applied after the sprinkler leaves the manufacturer.