Water Tank Fittings Explained
UK Flow Centre buying guide
Tank fittings: identify the connection before choosing the part
Tank walls, outlet sizes, threads and filling arrangements vary. A good installation plans the outlet, isolation, level control and safe overflow together.
1. Start with the job at the tank
2. The usual parts of a tank installation
- Tank connector or bulkhead fitting: creates the sealed connection through the tank wall.
- Outlet pipework and isolation: lets the system be connected and maintained safely.
- Float valve or level control: manages filling, where this is the required arrangement.
- Overflow: provides a safe route if the normal filling control does not stop water in time.
Do not choose from the thread alone. Check the tank-wall hole, wall thickness, pipe size, whether the connection is threaded or plain, and what is on the other side of the wall.
3. Choose by the application
- New outlet on a water tank: select the tank connector first, then match the outlet pipe and valve.
- Replacing a failed fitting: measure the hole and show both sides of the tank wall before ordering.
- Automatic filling: choose suitable level control and include a correctly planned overflow.
- Pumped system: plan isolation, pipework, protection and the pump duty as a complete system.
Before you order
Take photographs inside and outside the tank, measure the hole and the outside pipe diameter, identify any existing thread and say whether the tank stores potable or non-potable water. That avoids the most common incompatible-fitting orders.
Shop float valves and level controls
Technical guidance from UK Flow Centre, operated by JK Irrigation Ltd.