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Tapping Chart

Product Assistance

To assist with determining the correct size connection for replacement units or units to fit your current system, we have created a table of external and internal thread sizes.

BSP

Male

Female

1/2"

20.7mm

19.2mm

3/8"

16.6mm

15.0mm

3/4"

26.1mm

24.2mm

1"

32.8mm

30.4mm

1 1/4"

41.6mm

40.0mm

1 1/2"

47.6mm

44.9mm

2"

59.3mm

56.9mm

1 3/4"

N/A

50.8mm

2 1/4"

N/A

63.0mm

15mm Compression

20.7mm

19.2mm

22mm Compression

28.3mm

26.7mm

28mm Compression

34.6mm

32.6mm

Capacity Calculator

This calculator is designed to assist the specification of a cylinder by determining the amount of hot water available from a cylinder of a specific size; this can be particularly useful in situations where space for a cylinder is limited.

Height mm
Diameter mm
Literage Litres.

Uninsulated Cylinder Calculator

This calculator is designed to assist the specification of a cylinder by determining the size of the cylinder from it's circumference and insulation thickness; this can be particularly useful in situations where a replacement cylinder is required, but due to the insulation it is difficult to determine the size of cylinder required.

 

 

Please note - The final figures are approximate and should be rounded to the nearest standard diameter (375,400,450 etc.)

Circumference mm
Average Insulation Thickness mm
Insulated Diameter mm
Uninsulated Diameter mm

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