A. CALIBRATION ASSEMBLY: Inner and outer plastic housings with printed calibration paper between
housings. Withstands up to 70 PSI. (options -glass inner piece)
B. INDICATOR TUBE: Red HDPE plastic
C. LOCK NUT: Red plastic to hold calibration assembly in place. (options -aluminum lock nut)
D. DURO NITRILE GASKET: On which flanges on base of calibration assembly are firmly seated to
prevent leakage. (options -viton gasket)
E. ALUMINUM DIE CAST BUSHING: Type H-1.5 fits 1.5” standard npt tank flange. Type H-2 fits
standard 2” npt tank flange. This is the only part of the gauge that differs between types H-1.5 and H-2.
(options -stainless steel)
F. STANDARD ROD: 0.1875 dia. galvanized steel rod. (options -stainless steel)
G. PUSH ROD: 0.125 dia. galvanized steel rod activates indicator disc by movement of float arm.
(options -stainless steel)
H. BRASS RIVETS: Four brass tubular rivets. (options -non-riveted, stainless)
I. FLOAT ARM ASSEMBLY: 0.1875 x 0.0625 galvanized steel flat rod, including bracket and rod,
attached to standard, push rod, and plastic float. (options -stainless steel)
J. PLASTIC FLOAT: High density polyethelene float 1.125” dia. x 3.0” long. (options -stainless float,
nitrophyll float)
Therma Gauges are manufactured to fit specific tank depth dimensions, 6 inches to 12 feet. Although we do
recommend the L Gauge (page…18) on tanks 10” and under. Standard rod, push rod, float arm
assembly are varied in length to provide correct operation of gauge.
Ordering Instructions — Part numbers are as follows: H-(size opening)-(depth in inches) Example H-2-48”.
Gauge is also available in 275 gallon format. Ordering Instructions for vaulted tanks.
Optional All Stainless Steel Model — When ordering, state “All SS” after part number. This model provides
stainless floats, stainless rods, stainless bushing assembly, glass calibration insert, and aluminum lock nut.
Other Options Available — Alarm, Gauge Guard
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