Oil level sight glass,Bulls eye Sight Glass,Fluid level Sight Glass,Circular oil sight Glass

Oil level indicator sight glass,oil sight gauge,Oil sight windows,Visual level sight glass

Visual level indicator,Visual level sight gauge,domed shape sight glass.

Material Body:   Stainless steel 304,Stainless steel 304L,Stainless Steel 316,Stainless steel 316L

O-Ring: Viton,FKM,NBR, Aramid gasket and Copper seal

Glass Thickness: 2mm to 5 mm

Reflectors: Stainless Steel 304 Reflector

                 (Any type you can chose with reflector or without Reflector,  You also can add float ball.)

Glass Type: Natural Glass,Tempered Glass and Borosilicate Glass 

Resist Tempreature Range:-30'C to 220'C

Pressure Range:  5-120 Bar(0.5MPa to 12 MPa).

Thread type:NPT,NPTF,UNC,UNF,Metric and BSP(G thread)

Size： Below you will get the size you wanted.Another size is okay.OEM are welcome.

Usage:  Pump,Oil Receivers,Gearboxes,Speed Reducer,Compressor and Power Transimission.

Extend the life of vehicles and help prevent costly repairs with sight plugs from Grandmfgcn team. Lube sight checks give a quick visual inspection and show the presence of oil in gear cases, bearing housings, or indicate liquid levels in reservoirs. They are observation windows to check burner flames, gears in motion, relay or switch operation in sealed housing.