*PLUMBERSSTOCK EXPERT* responded:
Thank you for your question about this Broan-NuTone 3808. If I understood your question correctly, you're asking if this 8-foot PVC tubing will fit with schedule 40 fittings. No, that will not work. Central vacuum pipe is 2" to the outside of the pipe and schedule 40 pipe is 2" inside diameter. If you're ready to place an order, feel free to click "Add to Cart", fill out the required fields, and you'll be all set. Have a fantastic day ahead!