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By certification 
"Instruction:
Manufactured according to JIS F7400 standards. The valve material can be chosen by customers.
Materials of major parts
Body – Tin Bronze-ZQSn10-21
Seat, Dis -Albronze – QAL--21"
Manufactured according to JIS F7400 standards. The valve material can be chosen by customers.
Materials of major parts
Body – Tin Bronze-ZQSn10-21
Seat, Dis -Albronze – QAL--21"
