SY type pump is a vertical fiberglass submersible pump, WSY type pump is a vertical fiberglass submersible vortex pump, and FSY type pump is a vertical fiberglass submersible centrifugal pump. The pump extends into the storage tank and can start delivering liquid without filling as long as the liquid is higher than the pump body. There is a leakage hole under the flat cover plate. The liquid will not leak outside the storage tank.