Kupferle’s #3400 Yard Hydrant Companion is a pre-installation sleeve for any ¾” yard hydrant. Install the Yard Hydrant Companion first, and then slide any ¾” yard hydrant down the sleeve and thread it onto the Yard Hydrant Companion’s internal ¾” nipple. Clamps at the ground line hold the hydrant in place. Then, when your hydrant needs to be replaced it can be done WITHOUT DIGGING! Just undo the clamps, unscrew the entire hydrant and then repair and replace or install a new hydrant into the sleeve. Available in any depth of bury.Certified to NSF/ANSI 372.