preformed pipe fittings and valve covers shall be prefabricicated in a maximum of two precision formed sections and size to cover and weatherproof. where available the elbow covers shall be fabricate from 1. thick aluminium with factory applied epoxy moisture barrier on the inside and the tedlar coating on the outside. For pipe size where preformed covers are not available, they shall be aluminium gore type. For insulation to be utilized, as fireproofing the jacketing for all fittings shall be type316,