You searched for "overflow"
Pipelife
Pipelife Rainwater gully (bottom overflow) 110 mm 155181
Part: 155181
PVC overflow gully for rainwater collection and emergency drain protection.
Van Walraven
Van Walraven PVC overflow 12 l/s, 315 x 125 mm 155188
Part: 155188
PVC emergency overflow tank preventing water backup, capacity 12 litres per second.
Anjo
Anjo PP flat roof outlet 60 x 100 mm, outlet 80/100 (grey) * 153041
Part: 153041
Polypropylene roof hopper outlet with overflow for flat roof drainage.
Anjo
Anjo PP flat roof outlet 60 x 80 mm, outlet 70/80 (grey) * 153040
Part: 153040
Grey polypropylene flat roof outlet with overflow and seal.
Pentair Jung pumps
Pentair Jung pumps Pentair Jung overflow box U5KS in crate Flutbox 611038
Part: 611038
Portable submersible pump in carrying crate for emergency flooding and high water removal.