| http://www.w3.org/ns/prov#value | - essure to the packing, a ring 2I made of any suitable material, such as brass or bronze, is placed around the outer surface of the valve If], the said ring abut- ting against the lower end of the body portion I. The external threads I2 on the lower end of the valve Ill are of lesser diameter than the valve itself, whereby the flange ring 8 and the ring 2| may be easily slipped on the outside of t
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