| http://www.w3.org/ns/prov#value | - As shown in FIGS. 1 and 2, valve seat 9 is constituted by a circular ridge 29 surrounding hole 24 on the underside of cover 21 and valve means 11 includes a resilient flexible circular pad 30 of a suitable somewhat resilient material, such as a synthetic rubber, secured to the surface of disk 11 adjacent outlet port 9.
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