Echo PB-255ES Operator's Manual page 16

Before you start
1. Vacuum elbow
1. Locking ring
1. Debris bag
3. Align locking ribs (J) on vacuum elbow with recesses (B) in
locking ring, and slide vacuum elbow into locking ring.
4. After pushing vacuum elbow all the way in fan case so that
line (K) will meet locking ring, rotate locking ring clockwise
1/8 turn to lock vacuum elbow in place.
5. Place debris bag opening over flared end of vacuum elbow,
and cinch debris bag securely at the position (L) with Velcro
strap.
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