wrench, spears 8171 bulkhead fitting
Bought a couple of 1-1/4" bulkhead fittings for my rain barrels, and this was a new style and needed a wrench. In the pictures the orange wrench is the smaller inner diameter one, and the white one is the larger outer ring one.
Amazon: Spears 8171-C Series Bulkhead Fittings
Printed: 0.38mm (Speed), 30% in-fill, no support, skirt, ABS material