DURAN Single way stopcocks ground and polished_without keys， bore 6 mm， NS 21.5

without keys， bore 2，5 mm， NS 14.5， "side arms 9 without keys， bore 4 mm， NS 14.5， "side arms 10 mm without keys， bore 4 mm， NS 18.8， "side arms 10 m without keys， bore 6 mm， NS 18.8， "side arms 13 mm without keys， bore 1，5 mm， NS 10 without keys， bore 1，5 mm， NS 12.5 without keys， bore 8 mm， NS 24 without keys， bore 10 mm， NS 29.2