Used to make a watertight connection between aquarium and the pipe fittings. Please see note below on tank connector internal diameter sizes and recommended hole drill size range.Please Note: Due to the design, these tank connectors reduce the diameter in the centre of the connector. Please see detailed dimensions in the specifications below. If a larger bore diameter is required, we recommend upsizing on the tank connector bulkhead and using reducing spigots in each end to maintain a constant internal diameter.Our metric PVC Aquarium / Pond solvent weld plumbing is ideal for various plumbing jobs in your aquarium or pond. Specification:Fitting Type: Standard Ball ValveOpening 1 Compatible Pipe Size: 32mmOpening 2 Compatible Pipe Size: 32mmInternal Centre Diameter: 24mmSuitable for drilled holes: 32mm-42mmMaterial: uPVC