This 110mm (4”) Bottom Drain is designed to work with standard 110mm solvent weld pipes. Durable for liners, tanks and fibreglass up to 5mm thick. Supplied with stainless steel screw fixings throughout, not buckle plated some cheaper versions have.
Bottom drains are almost a must for modern pond filtration especially gravity filter systems you can even use multiple drains linked together on large ponds air ponds that are shaped. Comes with a domed top, fixing plate and all screws needed to install.