Aqua Water filter housing offer the versatility to meet all of your large capacity filtration needs, including high-flow and heavy-sediment applications. The 20 Inches he tall housing allows for greater cartridge capacity, reducing the number of vessels required for high flow-rate applications. built of durable reinforced polypropylene and highest pressure. And they accept a variety of 4½ inches diameter x 20 inches length cartridges for different applications