uxcell Plastic Aquarium Pump Duckbill Nozzle Water Outlet Return Pipe Plumbing Fitting Black Material: Plastic;Total Size: 90 x 30 x 27mm/3.5" x 1.18" x 1.06"(L*W*T) Nozzle Size: 30 x 7mm/1.18" x 0.28"(L*W);Thread Outside Diameter: 21mm/0.83" Wide use at Aquarium, fish tank and pump. Use with circulating pump or return pipe.(Not included here) Please measure your need size before purchase.