Features: This PVC connector is designed for aquarium,used to connect the water pipes of both sides and prevent the aquarium from leaking. Leakage-proof: Come with transparent rubber ring, which has strong toughness, prevent water leakage and more reliable. Clear thread: The polished finish surface has better hand feelings, the thread is clear and more smooth to use. Firm connection: Both ends hexagonal design, can firmly clamp the pipe and avoid leakage. Material: This joints set is made from PVC material, the pipe is thicken, solid and durable. Specifications: Material: PVC Color: black Types: 1(with rubber ring), 2(without rubber ring) 20mm/25mm overall height: (Approx)6.8cm 32mm/40mm/50mm overall height: (Approx)8.5cm Size: (Approx) Connector inner diameter 20/25/32mm/40mm/50mm 1 Package includes: 1 PC x Connector 1 PC x Rubber Ring 2 Package includes: 1 PC x Connector Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!