What Is a Class 125 Fitting and When Should It Be Used?

If you’re thinking class 125 fittings look a lot like schedule 40 PVC, and you can’t seem to find a visual difference, there is a reason. Class 125 fittings and schedule 40 PVC fittings are manufactured in the same way and come off the same assembly line. So why are schedule 40 PVC fittings more costly and what’s the difference?

Schedule 40 PVC Fittings

Schedule 40 PVC fittings must undergo rigorous testing before they are allowed to leave the manufacturer. This testing ensures the parts are NSF approved and that they meet ASTM standards. This testing is expensive, and therefore, the prices are higher for schedule 40 PVC fittings than class 125 fittings. However, because schedule 40 PVC fittings undergo testing and meet standard approvals, codes require schedule 40 PVC fittings, and thus pass inspections.

Class 125 Fittings

Class 125 fittings do not undergo any testing. They are taken straight from the assembly line and are shipped from the manufacturer. Since class 125 fittings forego testing, they are cheaper; however, they do not pass inspections.

When is it okay to use class 125 fittings?

If your job doesn’t require inspections and you are worried about costs, class 125 fittings may be your best bet. Although it is not a guarantee, you should get the same performance from class 125 fittings as you would from the schedule 40 PVC counterparts. Another thing to consider is the availability of class 125 fittings – they tend to only be offered in large diameter sizes. If your project only requires smaller diameters, don’t fret about the unavailability of class 125, as schedule 40 PVC is still exceptionally cost-effective. But if you’re using larger diameters, they can get pricy, so class 125 fittings can help to offset the costs.

You should only use class 125 in the same situations where schedule 40 PVC would be acceptable. Therefore, do not use class 125 fittings for high-temperature and/or high-pressure applications. You will need schedule 80 PVC or schedule 80 CPVC, depending on your specific job.

If you have any other questions about class 125 fittings or schedule 40 PVC fittings or anything else, just give us a call or send an email. We are happy to help!