Has anyone had a 90 degree shut off valve fail to turn. The handle turns but nothing flows. I hope I have a clog/blockage near the shutoff. But it may be the pin from the handle to the ball have separated. for now I will just do pump outs, but was wondering if this has happened to anyone else. I don't know how anything could plug this but you never know what is in there. Randall A54 #56