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Imperial / Metric Pipe & Fitting Guide

Please find below IrrigationUK’s useful guide to Imperial or Metric pipe and fittings

The sizes indicated in the metric systems are the actual size of the outside diameter of the pipe,in millimetres. Inch and metric systems (excepting 2 1/2” / 75 mm and 5” / 140 mm) are completely different sizes, and can only be joined together using adaptors or flanges with a common P.C.D.The following table indicates the approximate equivalent inch and metric sizes:Where applicable PVC fittings are according to ISO 727 and WRAS for potable water. Metric fittings with threads have DIN thread ie taper male parallel female. DIN 2999. Imperial Fittings conform to BS 4346/1 ISO 9002 for pipes made to BS 3505 and BS 3506. Thread are parallel BS 21 male and female.


bar = bar mbar = millibar Pa = Pascal kPa = Kilopascal MPa = Megapascal 1PA= 1 N/m² 1 Kp/cm² = 1 at 1 mm Hg = 1 Torr mm WG = mm H20 = mm WS

Contact Us

Tel 01284 753 865
Mob 07768 347 274

24 Pembroke Road
Bury St Edmunds
IP33 2JD

Available Mon – Fri, 9am to 5pm.
Correspondence address only. We have no trade or retail desk.


We are members of the Federation of Small Businesses

About IrrigationUK

IrrigationUK supply a wide range of water irrigation systems, watering and swimming pool products to farmers, gardeners, small holders, farms, golf courses, hotels and factories etc.

IrrigationUK is owned and operated by TBDC Ltd, Company number 07672413 registered in England at the address. VAT Number GB 230 0039 75.

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