Compatible with the original OEM small black diamond pins on Manabloc, Viega, Vanguard, Pureflow, and PEX water valve systems Fits over any male diamond stem pins that are 1/4” x 5/16” Instructions included Posiiwrx Brand Product No-Lead material Made in the USA Posiiwrx Aftermarket Diamond Slotted T-handle Wrench Key Tool. Compatible with older Manabloc Viega Vanguard PureFlow PEX black pinned valve stems. Fits over 1/4” x 5/16” male diamond pins. Does not work with larger red or blue diamond pins. Posiiwrx is not associated with other trademarks listed here. Trademarks are the property of their respective owners.