is a self-sealing waste valve for use as an alternative to
a traditional water seal trap, in particular where a water seal trap
is not suitable, for example, due to climate, movement of the
appliance or because of infrequent use. Its in-line design and the
option of either horizontal or vertical installation can save space.
The valve can also reduce the requirement for additional venting
of some appliances.
is made of a polypropylene body with an elastomeric
membrane, in the form of a self-flattening tube, acting as a selfsealing
valve. The self-closing membrane prevents foul air from
drainage systems from entering the building and also acts as an