Taper (cone) seat unions. This popular brand of unions are highly durable and have great temperature resistance and therefore can be used safely in a very broad field of applications.

Intermediate pressure rating at temperatures between 120°C and 300°C can be obtained by linear interpolation.
Hot dip galvanised fittings should not be used below -10°C.

BS 143; BS 1256; BS 21; ISO 49; ISO 7/1

Malleable Fittings - Unions

George Fischer malleable iron pipe fittings are to BS143/1256, ISO49 and threads (taper male and parallel female) are to BS21, ISO7/1. The fittings are available self-colour (black) or hot dip galvanised finish to BS729 for increased corrosion resistance. Pressure rating is 25 bar at service temperature -25°C to +120°C and 20 bar at 120°C to 300°C.,Crane Fluid Systems straight pipe fittings are available self-colour (black) or galvanised finish, with taper internal and external pipe threads to BS21 and ISO7 for pressure-tight joints. They can be used with BS1387 steel tube for air, gas, steam and water services. Pressure rating is 25 bar at service temperature -20°C to +120°C and 20 bar at 120°C to 300°C.