6 EQUIPMENT FOR EXTERIOR INSTALLATION AT LOCATIONS HAVING GASOLINE DISPENSING FACILITIES-NAMELY, VALVES, MANHOLES, CAPS AND ADAPTORS THEREFOR, FILL BOXES, AIR VENTS, STRAINERS, GROUNDING CLAMPS, HOSE COUPLINGS AND CLAMPS, HOSE RETRIEVERS, PRODUCT IDENTIFICATION MARKERS, AND VAPOR RECOVERY SYSTEMS COMPRISED PRINCIPALLY OF STANDARD UNITS