11 Heat pumps; water heaters; water filtering apparatus; water purifying apparatus and machines; water purification, treatment, and distribution installations; water softening apparatus; [electric water heaters;] agricultural irrigation units; pressure water tanks and parts therefor; air purification and filtration apparatus; [heating elements; heating cables and mats; electric heating cable systems for use in heating water, surfaces, roofs, gutters, floors, pipes, and tanks in industrial, commercial, and residential applications; heating mats, pads, and sheets for use in heating water, surfaces, roofs, gutters, floors, pipes, and tanks in industrial, commercial, and residential applications; heating apparatus for pipes, vessels, tanks, and architectural surfaces; heating apparatus for solid, liquid, or gaseous materials; immersion heaters; glue-heating appliances; heating filaments; electric unit heaters; sprinkler heads;] plumbing fittings, namely, dry pipe valves and accessories, namely, accelerators; air maintenance devices, namely, devices used to maintain proper air pressure in sprinkler systems; plumbing fittings, namely, post indicator valves to open or close a valve or to indicate the position of a valve; apparatus for heating, drying, water supply and sanitary purposes, namely, water supply pumps; [fire hydrants;] underwater pool and spa lights and lighting fixtures; interior lights for swimming pools; above-ground pool lights; niches for swimming pool and spa lighting; landscape lighting; landscape lighting installations and fixtures; [fiber optic lighting fixtures; light sources for fiber optic cables;] water filters for swimming pools, spas, hot tubs, ponds, and water parks; filtration units comprised of a filter and module for use with swimming pools and spas; pool and spa cartridge water filters; replacement filter cartridges for swimming pools and spas. filter laterals with porous body for replacement cartridges and upgrade kits for use with swimming pools and spas; in-line filters for use with swimming pools and spas; aquarium and pond filters and filtration apparatus; swimming pool water cleaning and filtering units; sand filters for use with swimming pools, water parks, aquariums, and industrial water treatment applications; diatomaceous earth water filters for use with swimming pools and spas; purification installations for sewage; automatic and front-access skimmers for use in removing foreign particles from swimming pool water; water inlet, outlet, and directional fittings for use with swimming pools and spas; drain rings, grates, and cup anchors for use with swimming pools and spas; ultraviolet sterilizers for ponds and aquaculture; above-ground swimming pool skimmers; side-wall pool skimmers; ozone water purification unit for use in the purification and sanitizing of water in swimming pools, spas, fountains, [agriculture systems, aquaculture,] cooling towers, drinking water systems, theme park displays and aquariums; automatic chlorine generators for swimming pools, spas and water parks; heat pumps to heat water in swimming pools and spas; gas heaters and boilers for pools, spas, theme parks, and water parks; pool and spa water heaters and pool and spa water heating systems; valves for use with swimming pools, spas, hot tubs, ponds, and water parks; water flow control valves for use in industries and applications where control of high volume flow of water is needed; a waterfall delivery system for swimming pools, spas, fountains, and ponds; ornamental and decorative water fountains. laminar water jet with deck box for use with pools, spas, ponds, and water fountains; automatic watering installations for agricultural and horticultural use; plumbing supplies, namely, clamping assemblies comprised of rings, clamps, knobs and thread connectors used for spa and pool filtration tanks; drain covers, frames, and grates for pools, spas, ponds, and water parks; automatic water systems for swimming pool and spa use, each sold as a unit, comprising pump, motor, tank and parts therefor; [filters, heaters, and air blowers, sold in combination, for use in heated pool spas;] water return fittings; apparatus and dripper irrigation system for water treatment which is comprised of filters, pumps, regulators, and heaters sold in combination for use on swimming pools, waterparks, aquariums, zoos containing water areas and aquaculture; filters for use with ponds, natural and man-made [lakes, rivers, streams,] waterfalls, water fountains, water gardens, and other water features; filters for use with fish hatcheries, hydroponics, and aquariums; filters for use in aquaculture; filters for use in aeration equipment; filters for use in irrigation systems