Imperial to Metric Pressure Pipe Converters
Join different pressure-pipe systems with the right adapter
These converters are for joining the listed imperial and metric pressure-pipe sizes. They are fittings for different pipe standards, not a table of direct inch-to-millimetre measurements.
| Specification | Details |
|---|---|
| Option 1 | ¾-inch imperial to 25 mm metric |
| Option 2 | 1½-inch imperial to 50 mm metric |
| Option 3 | 2-inch imperial to 63 mm metric |
Measure the pipe, not just its name
Imperial pressure-pipe sizes are nominal. A fitting marked 2-inch therefore cannot be selected by measuring 50.8 mm across an unrelated pipe or hose. Check the actual pipe outside diameter, system and the converter’s mating arrangement.
Look at whether each part is a socket, spigot or threaded connection before ordering the remaining fittings. An adapter does not make waste pipe, pressure pipe, ABS, PVC and flexible hose interchangeable.
Prepare the joint for its material
Follow the pipe-system and cement instructions for cutting, deburring, cleaning, insertion and curing. Check the layout before bonding, because a completed solvent-weld joint is not intended to be pulled apart and reused.
For surface preparation on compatible plastics, see Griffon pipe cleaner. A suitable glue brush can help apply the specified cement; it does not replace the correct preparation or curing time. Browse pond pipework and fittings to complete the run.
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