A. PVC slice gate valves are very easy to open and close by simply lifting the handle to open or pushing down on the handle to close. PVC gate valves, however, operate by turning a round handle that in turn rotates a plastic stem or shaft to open or close the gate. The channel the gate closes into can become clogged with dirt or debris and keep the gate from closing all the way, causing water to leak through the gate. When this happens the operator will try to close the gate by further applying pressure to the handle, to turn the shaft, usually resulting in a broken valve or stem. We believe the normal operation of a PVC gate valve puts too much stress on the plastic stem/shaft causing premature failure. We would much rather sell a ball valve (much more superior product) which is incapable of collecting dirt in a channel of the valve and the handle stem is directly connected to the ball that opens and closes in half a turn of the handle.