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Seetru circular window sight glasses are compact low cost assemblies that provide reliable level indication and positive indication when liquid is present. These screw-in plugs are fitted with high quality glass. They are suitable for a wide variety of liquids including water, oils and lubricants. They operate at temperatures up to 180°C and pressures up to 24 bar g.

Seetru Circular Window Sight Glasses are, for example, widely used in small chemical storage tanks, compressor crank cases and other machine housings and have proved to be highly reliable and economic.

'SF' & 'SG' Flat Glass Window
Connections	Dimensions (mm)				Standard working
BSP/NPT	A	B	C	D	pressure (Bar g.)
1/2"	33	30	19	14	16
3/4"	33	31	19	16	16
1"	38.1	34.5	21	19	16
1¼"	52	37	31	22	24
1½"	52	36.5	31	22	24
2"	54	40	45	27	14.5
Features: • Positive indication when liquid present. • Reflector provides visual enhancement of coloured liquids (SG model). • Cushioned against shock, the glass window is fully sealed.