These Liquid Level Gages feature a durable Trogamid nylon sight.  The square shank with pipe thread screws into a tapped hole on the side of a reservoir. A full rotational clearance is not necessary; the union coupling is installed without rotating the entire gage. 
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B3641-30116BA1W_1.5 Sight Opening 0.125 MNPT Union Coupling Vented Nylon Gage

Vented Union Coupling Elbow Nylon Liquid Level Gage, 1 1/2” Sight Opening, 1/8” Male NPT Mounting Thread
B3641-30116BA2W_1.5 Sight Opening 0.25 MNPT Union Coupling Vented Nylon Gage

Vented Union Coupling Elbow Nylon Liquid Level Gage, 1 1/2” Sight Opening, 1/4” Male NPT Mounting Thread
B3641-30116BA3W_1.5 Sight Opening 0.375 MNPT Union Coupling Vented Nylon Gage

Vented Union Coupling Elbow Nylon Liquid Level Gage, 1 1/2” Sight Opening, 3/8” Male NPT Mounting Thread
B3641-30116BA4W_1.5 Sight Opening 0.5 MNPT Union Coupling Vented Nylon Gage

Vented Union Coupling Elbow Nylon Liquid Level Gage, 1 1/2” Sight Opening, 1/2” Male NPT Mounting Thread
B3641-30216BA1W_2.5 Sight Opening 0.125 MNPT Union Coupling Vented Nylon Gage

Vented Union Coupling Elbow Nylon Liquid Level Gage, 2 1/2” Sight Opening, 1/8” Male NPT Mounting Thread
Sight Opening N/A 1 1/2" N/A 1 1/2" N/A 1 1/2" N/A 1 1/2" N/A 2 1/2"
Height from Center of Mounting Hole N/A 2 27/32" N/A 2 27/32" N/A 2 27/32" N/A 2 27/32" N/A 3 27/32"
Mounting Thread N/A 1/8" Male NPT N/A 1/4" Male NPT N/A 3/8" Male NPT N/A 1/2" Male NPT N/A 1/8" Male NPT
Feature N/A Union Coupling
Body Material N/A Nylon, Aluminum Alloy
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