It's the brass valve in front of the water meter. It doesn't move at all. It's broken. Found the following axis of rotation is not rust, copper plated iron, with a screwdriver to the ball screw, screw is not moving, the valve is much worse than PPR. Real junk products
What caliber, faucet is generally small caliber ball valve, can be replaced directly, if it is large, high cost words. Repair may be considered. Generally two problems: 1, stem wear or exercise, can not transfer to the ball core, you need to replace the ball valve; 2, the core of the groove long time work under the edge of wear and tear, slipping, you can replace the ball core;
There is a ball groove, the shaft is connected with a handle is installed in the tank, due to frequent water tap connecting parts have a certain slope groove and the shaft, causing slipping the ball still turn the handle when (the metal ball). Difficult to repair, usually replace the whole ball valve.
That's the valve stem. It didn't eat in the slot. The product was useless. Buy a new one
