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Y50 Back entry squeeze type surface

Y50 Back entry pressing type with plastic surface

Y53 Bottom entry with explosion-proof hole\squeeze type

Y53 Back entry pressing type with plastic

Y53，Y54 Bottom entry squeeze type

Y49 Bottom entry explosion-proof type\pressure type with plastic surface

Y55 Bottom entry thread with plastic surface

Y60 Back entry squeeze type

Y60 Bottom entry with leed seadling