Phillips Manufacturing Expansion Joint relieves the stresses of expansion and contraction associated with natural shrinkage during stucco curing and basic thermal changes. Phillips #15 minimizes cracking in large plaster areas and provides ground to assure proper plaster or stucco thickness. Expanded flanges allow for quality keying. This product is available in 1/4″, 3/8″, 1/2″, 5/8″, 3/4″ and 7/8″. Phillips #15 is available in either galvanized steel or zinc.