Hydrotech Precision-PWS 8-5 OWNERS GUIDE - Manual (Page 20)

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Tightening Sight Gauge Nut Diagram
11. Refer to the Tightening Sight Gauge Nut Diagram above. To fully
tighten the nut, turn the valve counter-clockwise1/4 of a turn to the start
position and ensure that the jam nut is still hand tight. Holding the jam
nut, turn the valve clockwise until upright at the finish position.
12. Remove the #10-24 screw from the sight gauge support and install
through the inside of the storage tank using a Phillips screwdriver.
Tighten until snug only.
13. Make sure the storage tank is free from any dust or material and replace
the storage tank lid.
14. Check for leaks when storage tank begins filling.
NOTE: The sight glass is fragile, do not push on the gauge (push on
bottom near threaded area).