Brand new Mainstays Type D Pool Pump filters 2pack Enhance the quality of your pool with the Mainstays Type D Universal Pool Filter Cartridge 2 Pack. Designed for hot tubs, above ground pools, and in-ground pools, these filters are compatible with Universal Type D Pumps. The package includes 2 filters which are easy to install and offer a limited lifetime warranty. The cartridges are 4.2 inches in length and 3.8 inches in height, providing efficient filtration for your pool. Brand new and of modern style, the Mainstays Type D Universal Pool Filter Cartridge 2 Pack is an ideal choice for pool owners who want to maintain the cleanliness of their pool.