Measuring the Height

Looking at the valve straight on, measure the height of the valve starting just above the insulated pipe section - or the highest point of the valve - down to the lowest point of the valve.

Measuring the Length

Looking at the valve straight on, measure the length of the valve plus 2 inches on either side.

Measuring the Width

Looking at the back of the valve, measure the width (right to left) making sure you accommodate for any protrusions, stems or levers.