Ace Pelizon Plumbing will test 5 backflow devices on site. Test forms to be submitted to LA county and walnut valley water district by Ace Pelizon Plumbing. During testing the number 1 shut off valve for Wilkins 975xl2 1 1/4 inch backflow device froze in closed position and handle shank broke off. Dis assembled backflow and valve and turned to open position ****this valve is still not functional and is frozen in open position. Will need to order tapped valve and return to install.