hi i found some class 18 pipe its really thick but in New Zealand we use Class A-F as a pressure rating and class 4.5-18 is the old way of describing its pressure rating but i cant find out how much PSI it can go up to.
can anyone help me
Pressure Ratings
- singularity
- Corporal 5

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what are you using it for
- boilingleadbath
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class 18 means it's pressure rated to 18 bar.
18 bar = ~280 psi
18 bar = ~280 psi
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