Britax Agile Plus User Instructions page 18

11. TO SECURE YOUR CHILD IN THE HARNESS
D Tighten or loosen the
waist straps, hold and lift
the 4 bar slider and then
pull the harness strap, to
adjust to the desired fit.
The waist strap needs to fit
firmly around the child.
E Tighten or loosen the
shoulder straps, slide the
3 bar slider up or down to
adjust to the desired fit.
Always adjust the harness
strap when changing the
seating position of the child.
CAUTION: DO NOT SLIDE 3 BAR SLIDER OVER THE SEWN
TAB ON SHOULDER HARNESS
18
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4 bar
slider