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Sight glass 圆形铜油镜油标视镜油窗液位计油量计body material:brass;window:tempered glass;seal ring:NBR/FKM;Working temperature:-10 +120/-20 +180视镜本体材质：铜；视窗：钢化玻璃；密封圈：NBR/FKM;工作温度：-10 +120/-20 +180No SIZE D d L a b c e1 G3/8 22 9.1 18 4 8 12 2.62 G1/2 26 11.6 21.5 4 8 12 2.63 G3/4 32 16.1 27 4 8 12 2.64 G1 38 22.1 33 4.5 9 13.5 2.65 G1-1/4 48 28.1 40 4.5 10 14.5 3.26 G1-1/2 55 33.1 47.5 5 11 16 3.27 G2 68 43.1 60 5.5 11 16.5 4.58 M12 9 M16*1.5 22 9.1 18 4 8 12 2.610 M20*1.5 26 11.6 21.5 4 8 12 2.611 M22*1.5 12 M24*1.5 13 M26*1.5 14 M27*1.5 32 16.1 27 4 8 12 2.615 M30*1.5 36 20.1 30.5 4.5 8.5 13 2.616 M33*1.5 38 22.1 33 4.5 9 13.5 2.617 M36*1.5 42 25.1 35.5 4.5 9 13.5 2.618 M42*1.5 48 28.1 40 4.5 10 14.5 3.219 M48*1.5 55 33.1 47.5 5 11 16 3.220 M48*2 21 M50*1.5 22 M60*1.5 68 43.1 60 5.5 11 16.5 4.521 M60*2