Keep the GT Water Products Drain King 3 to 4 inch Drain Unclogger Hose Attachment on hand for removing nasty blocks and backups in your drain. This reusable attachment uses the water from a standard hose to unclog main drains, outside sewer drains, basement drains and outside deck drains without the use of harmful chemicals. Unclogs drains 3" to 4" in diameterUnclogs main drains, outside deck drains, and basement drains