Metal fused sight glasses according to DIN 7079
Circular sight glasses for installation in sight glass fittings according to DIN 28120,
sight glass armatures according to DIN 28121,
pipe screw connection DIN 11851
Circular sight glasses for installation in sight glass fittings according to DIN 28120,
sight glass armatures according to DIN 28121,
pipe screw connection DIN 11851