The Superb Wrench Metal Slim Wrench fits the following:
The Universal Slim Line Filter Housing Metal Wrench fits universal RO and Slim Line housings, and features a half circle style. This water filter wrench is constructed with a longer handle for better grip and leverage. The universal filter wrench won't bend, bow or break due to its formidable zinc-plated, galvanized steel construction. This metal water filter wrench is labeled with a directional arrow to make sure you turn it in the proper direction.
Universal Slim Line Filter Housing Metal Wrench specifications: