Wilkins RK34-975XLC 3/4 Repair Kit. The Wilkins RK114-975XL includes everything you need to repair 3/4"-1" sizes Wilkins 975XLC Backflow Preventers. This is a Wilkins Genuinue Repair Kit. Our products are designed to provide the lowest life-cycle costs through low cost repair kits and easy maintenance. This complete repair kit provides internal parts for quick and easy repair of valve.