FFS-1072 Forecourt Guide 2025 2 - Flipbook - Page 22
DEFENDER SERIES® OVERFILL PREVENTION VALVE:
I N S P E C T I N G / V E R I F Y I N G 9 5 % L E V E L (without removing from tank)
For dimensions “A” & “B”: Refer to the Installation Record Sheet or re-measure and
recalculate per Figure 1.
1. Measure Dimension “Z” (Figure 18)
Upper drop tube flange
to edge of upper tube
adapter
“Z”
2. Verify using the calculation below
Measure
“Z”
Drop tube seal surface
to bottom of tank
“A”
- (Subtract)
95% Volume from
tank chart
“B”
4½"
(114 mm)
- (Subtract)
4.5" (114 mm)
95% Shut-off level offset
= (Equals)
95% Shut-off level offset
Note: Refer to Tech Update TB0617-01 Defender Series™ OPV Inspection for full inspection form.
NOTES:
