Garden Oasis 10 ft SQUARE COMMERCIAL OFFSET UMBRELLA Owner's Manual - page 6
Manual is about: DOUBLE PLASTIC BASE
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Step 05:
Fill entire base with dry sand and make level to the top of the triangular sections.
Add water to the sand for additional weight. A minimum of 125 lbs. of sand is
required for the first level.
Step 06:
Repeat the procedure of step 4 to install the remaining plastic base (M).
4
10x10′ Square Offset Umbrella Assembly Instruction
Step 04:
Install the Plastic Base (M) on the brackets. Embed the chocks of the left part
(M) into the rabbets of the right part (M).