| The Haws 6421 In-Line Strainer is an in-line strainer which features positive rubber seals molded onto a fine mesh screen and is retrofitted in most Haws drinking fountains. Located on the inlet side of the valve, this strainer provides protection from debris and contaminants. Strainer may be installed in-line using supplied 3/8" tubing connectors. Note: Model 6421 has replaced Model 6420. Product Details | Manufacturer | Haws | | Part # | 6421 | | Description | In-Line Strainer | |