27 on the bottom and a float 28 on the top both of which may be made of buoyant material more usually they will form a closed hollow air filled body if necessary weight can be added by a screw 28a or other weight means an annular resiliently deformable valve seal 29 fits in a groove in the flapper in its closed position seal 29 bears flat against and conforms to the valve seat in order to close the flush valve a lift chain 30 is attached to the flapper to lift it to open the valve in the embodiment illustrated in fig1 and 4 the valve seal is a flat disc that fits around the guide portion perhaps in a peripheral groove for a better fluid seal with it it is preferably adhered to the back plate by cementing or by being molded in place instead of a flat face it can be shaped for a better fit it can be made of very resilient material such as a foam or of a solid elastomer with significant deformability two arms 31 32 extend parallel to each other away from the valve plate each arm has a flat portion 33 and a stiffener flange 34 these arms are quite stiff and are not amenable to being twisted attachment means 35 on each arm comprises a socket 36 open at edge 37 with a slightly narrowed entry clearance 38 that forms a snap over interference fit.