a semi cylindrical interior passage 13 formed lengthwise through at least a portion thereof a generally circular plate 6 is formed integrally with or attached to one end of body 1 while a trough 10 is formed integrally with the other end of body 1 a semi circular opening or hole 14 is centrally formed in circular plate 6 and a flat lip or flange 11 is formed around the top edge of trough 10 and defines a u shaped opening 16 therein body 1 may be manufactured from polycarbonate or any other suitably rigid and durable plastic or other material a flapper valve i e a flexible and or resilient valve plate 17 is inserted into the top portion of interior passage 13 as shown in fig2 a portion of valve plate 17 is secured against body 1 for forming a hinge like or pivotal connection between the body 1 and valve plate 17 importantly the end of valve plate 17 that is not pivotally attached to body 1 extends completely into trough 10 and is seated against the underside of flange 11 when the valve is in the closed position valve plate 17 is typically manufactured or fabricated e.