Dripper irrigation systems, comprised of valves, filters and regulators; Drying apparatus for use in heating, ventilation systems, air conditioning systems and refrigeration systems; Electric freezers; Electric household dryers for shoes and gloves; Grill accessories, namely, charcoal grill conversion units for converting charcoal grills to electric smokers; Parts for heating and air conditioning systems, namely, heater cores and gas coolers for vehicles; Plumbing fitting, namely, vacuum release safety valve for flow shutoff in pools and spas; Swimming pool drain covers; Swimming pool water cleaning and filtering units; Water filtration and purification units and replacement cartridges and filters therefor