Sight glass, oil level indicator, liquid sight glass, sight window, viewports

Body material: aluminum, brass and steel

Glass:  Real glass 2 mm to 5 mm thickness.

O Ring:  Viton O rings

Size:  M10 to M42, 1/2 inch to 2 inch

Thread Type: Meter thread, BSP, NPT

Operate Temperature: -20 cent degree to 120 cent degree

Operate Pressure: 125 PSIG

MOQ: 2000 Pecs each size

Delivery time: 20 days.

Payment:  T/T

Different company have different requirements, OEM Service is welcome.