I need to install a repair kit on a Wilkins/Zurn 975XL 1/2 inch double check valve. The documentation I have found says that it takes a 'special tool' to remove and install the seats for the two check valves. What kind of a 'special tool' is it? I've got a customer with a leaking Wilkins 975 XL 3/4" backflow. I've got a customer with a leaking Wilkins 975 XL 3/4" backflow. It is a fairly steady trickle out the dump port on the bottom. I looked at it yesterday (had told him to turn it off at the front-end shut off valve). The Zurn Wilkins 975XL Reduced Pressure Principle Backflow Preventer provides high hazard protection for non-potable water applications. Wilkins Section of the BAVCO backflow reference manual. Reference Manual is in PDF format. If you have trouble, download Adobe Reader. Find and download user guides and product manuals. Zurn-Wilkins 1/2 in. Lead-Free Reduced Pressure Principle Assembly. 12-975XL2. HERE ARE THE KEY REFERENCES: Wilkins Zurn 975XL Specification Sheet http So that others can find it more easily, here is a step-by-step pictorial DIY showing each step in my repair today of my 1" ID Wilkins Zurn 975XL Backflow Preventer, thanks to your help at alt.home.repair. Manuals Directory ManualsDir.com - online owner manuals library. XL975. Manuals and free instruction guides. Zurn-Wilkins 2-975XL2SEU Use and Care Manual. Zurn-Wilkins 1-350XLSHFT Installation Guide. User manual Intel D975XBX. Manual de instrucciones Intel D975XBX. Home. Zurn-Wilkins. Model # 34-975XL2. The 975XL2 includes all the necessary components for managing your system, and is the simplest, most reliable backflow preventer in the irrigation market today. Use and Care Manual. You will need Adobe® Acrobat® Reader to view PDF documents. Define manual dexterity. manual dexterity synonyms, manual dexterity pronunciation, manual dexterity translation, English dictionary definition of manual dexterity. Noun 1. manual dexterity - adroitness in using the hands dexterity, sleight adeptness, adroitness, deftness, quickness, facility