[NMB-P] viewing window (integrated) with protective cover

Glass when removed from the ferrule is I put a protective cover to the viewing window that does not fall off (sight glass).
[NMB] viewing window (integrated) based on the , it has been fitted with a hinged cover .

○ By attaching to the ferrule of the container or the like, you can check the status of the internal container.
○ [NM] except window and [NM-P] except with window protective cover , it is safe because the glass does not fall off when removed from the ferrule.
○ when an impact is applied from the outside, it prevents the window is broken. It also prevents dust adhesion.
○ wetted parts for SUS316L, has excellent corrosion resistance.
○ the inner surface of the tapered shape, was to ensure the field of vision to the maximum.