DRAINAGE SYSTEMS METHOD AND MEANS FOR MAKING A FLUID-TIGHT CONNECTION BETWEEN COMPLEMENTARY MEMBERS

摘要

1421784 Rodding eye PLASTIDRAIN LTD 13 Nov 1973 [13 Nov 1972] 52360/72 Heading E1C [Also in Division F2] A rodding eye 6 in a drainage system includes a closure plate 10 incorporating a oneway valve arranged to automatically open in the event of a build-up of pressure in the system. The valve may comprise a separate member 13 seated in an aperture in the plate or may comprise the plate itself which is secured to the eye's rim 8 by screws which are longer than the screw sockets in the plate.