The New Summer Waves Swimming Pool TYPE D Filter Pump Cartridge 2 Pack by Polygroup is a modern and easy-to-install pool filter cartridge suitable for hot tubs, above ground pools, and in ground pools. Made in Mexico, this cartridge has a height and length of 4 inches and is designed for efficient filtration. The Summer Waves brand ensures quality and durability, making it a reliable choice for maintaining clean and clear pool water.