Tube OD 4 5 6 8 10 12 14 16Tube OD 4 5 6 8 10 12 14 16 18 20 22 25 28 32 34 40 42 BSP Thread 1/8" 1/4" 3/8" 1/2" 3/4" 1" 1 1/4" 1 1/2" METRIC Thread M10X1 M12X1.5 M14X1.5 M16X1.5 M18X1.5 M22X1.5 M27X2 M33X2 M42X2 M50X2 PRESSURE Grade( MPA) Grade E?16 GradeG?25 GradeJ?40