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Slot for scheduling by the fluid before returning, such as liquid cooling water pipe on the road in order to observe the liquid flow. This chapter has been selected through the glass plate, three plate glass, glass-type three straight. Material stainless steel carbon steel, aluminum, lead lining, rubber lining, plastic and so on. Nominal pressure range 2.5,6 kg / cm square two. Operating temperature: 200 ℃ in the metal below the plastic at 80 ℃ below the transition temperature to allow emergency 80 ℃; nominal diameter range of 15 ~ 150 mm to 200 mm of individual specifications. Nominal pressure of 6 kg / cm square of glass as an official mirror glass products, such as selection trial to be conducted.