Each Mod-Plus BF applicator features one or more adhesive valve modules mounted to a single service block, simplifying spare parts inventories. Each module operates with air pressure opening and closing the orifice. Air open/air close functionality reduces stringing and gives a clean, sharp cutoff every time throughout the life of the head, unlike spring-operated applicators which cause more stringing as the spring wears and loses tension. Oh, did we mention the air open/air close functionality is standard? In addition, the mounting brackets for the Mod-Plus applicators can be placed on the top or back, allowing for more versatile installation options. High performance seals (which are also standard) improve applicator life, while the platinum sensor allows for better temperature control over conventional temperature control sensors.