| http://www.w3.org/ns/prov#value | - Valve element 72 is freely movable in a recess 76 in the axle extension 73 of axle 60 and is normally biased by spring 30 into liquid and gas-tight engagement with the inner surface 32 of a rotatable bearing element 80 formed of Teflon, ultra high molecular weight plastic, ceramic, metal or other well-known materials inert to the agricultural chemicals and highly resistant to abrasion are used.
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