How to Install Insulation on Your Cold Water Tank

Ball valves control the level of water in your cold water tank. Over time the valve can become seized and will need to be replaced. When a ball valve stops working correctly, water will start dripping or flowing from the overflow pipe of the tank. Our simple step-by-step guide will help you fit a new ball valve.

What You Need To Complete The Job:

Protective gloves | Knee pads | Goggles | Dust mask | MDF board (or similar for kneeling on) | Adjustable wrench | New ball valve | Dry cloth

    Step 1: Turn Off Water
    Turn off the water at the mains.

    Step 2: Unscrew Feed pipe
    Wear protective gloves, knee pads, goggles and a dust mask as fibreglass insulation can cause respiratory and skin irritation. You should also avoid disturbing the insulation as much as possible.

    Lay an MDF board (or similar) over your attic insulation so you can kneel down comfortably beside the cold water tank. Using an adjustable wrench, unscrew the feed pipe instantor fitting.

    Step 3: Detach Feed Pipe
    Pull the copper pipe away from the ball valve housing.

    Step 4: Undo Retaining Nut
    Undo the retaining nut outside the water tank and remove the ball valve by pulling the valve body from the water tank.

    Step 5: Insert New Ball Valve
    Insert the new ball valve assembly, checking to make sure that the ball is securely attached. Pass the threaded valve housing assembly through the hole in the water tank and tighten into place with the retaining nut.

    Step 6: Reattach Feed Pipe
    Push the copper pipe, complete with its olive (the soft brass ring at the end of the pipe), into the valve body and tighten the instantor fitting firmly but carefully. It may be necessary to change the olive if it shows signs of damage. Dry the fitting thoroughly.

    Step 7: Check for Leaks
    Turn the water back on again at the mains, and check the new joint for any leaks by holding a dry cloth directly underneath the newly tightened fitting. If the joint is tight and there is still some water escaping, you have a damaged or deformed olive and you will need to replace it.