CPVC threaded adapters shall not be permitted.

CPVC threaded adapters shall not be permitted.

• A. True
• B. False
• C. True, unless going to metal
• D. Only with metal adapters

Answer: (C)

The main idea here is that CPVC threaded adapters aren’t allowed in general because CPVC threads can be prone to leakage and aren’t as reliable for long-term sealing in plastic-to-plastic or plastic-to-fitting connections. The one exception is when you’re transitioning to metal pipe. In that case, a CPVC-to-metal threaded adapter (a listed transition fitting) is permitted, since metal threads and the proper transition fitting provide a secure seal and proven performance. So the statement is true, with the caveat that connection to metal is allowed using the appropriate transition.

The main idea here is that CPVC threaded adapters aren’t allowed in general because CPVC threads can be prone to leakage and aren’t as reliable for long-term sealing in plastic-to-plastic or plastic-to-fitting connections. The one exception is when you’re transitioning to metal pipe. In that case, a CPVC-to-metal threaded adapter (a listed transition fitting) is permitted, since metal threads and the proper transition fitting provide a secure seal and proven performance. So the statement is true, with the caveat that connection to metal is allowed using the appropriate transition.