Part No. 920525 Rev A - Wayne 3/VISTA series Service Manual

5.4. DOUBLE BUMP TUBING
On 3/Vista dispensers, Double Bump product tubing is used between the iMeter outlet, proportional valve,
and hose outlet casting. The double bump connection eliminates the need to torque the compression fit-
tings that were used on the flare tubing.
As shown in the Figure 5-4, the oring fills the space between the "two bumps" , hence the name double
bump, and when the tube is inserted into the mating connection, the oring compresses or spreads across
this space, making a tight seal around the cylinder. The Safety Clip, while securing the connections, also
improves the seal by allowing some flexibility as to exactly where the seal is made.
FIGURE 5-4. DOUBLE BUMP TUBE BETWEEN VALVE AND HOSE OUTLET.
June 2001
O-RING
DOUBLE
BUMP
CLIP

Part No. 920525 Rev A

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