| http://www.w3.org/ns/prov#value | - with the downwardly facing abutment shoulder; and (II) a valve assembly comprising a valve seat secured within the hollow sprinkler head assembly tube, a valve engageable with the seat, the valve including a head and a stem extending therefrom, the stem being provided with a head, means in the valve assembly to support and guide the valve for reciprocal motion relative to the seat, the valve stem
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