Molded from rugged reinforced polypropylene, these housings are ideal for under-sink and countertop residential filtration, pre- and post-reverse osmosis filtration, recreational vehicle filtration, food service, humidifying systems and light commercial and industrial filtration. Additional Details ------------------------------ Product description: Molded from rugged reinforced polypropylene, these housings are ideal for under-sink and countertop residential filtration, pre- and post-reverse osmosis filtration, recreational vehicle filtration, food service, humidifying systems and light commercial and industrial filtration.