DuraVent 3"-8" Diameter PolyPro Reducer

Size: 3"-2"

Estimated Arrival: Between and . (To All Contiguous States)

✔ Same-Day Order Processing
✔ Free Returns
✔ No Restocking Fees
✔ Financing Options Available

Text or call 888-992-1556, start live chat, or email with any questions. Our team is available to serve you 8:00 AM - 11:59 PM ET, 7 days a week.


DuraVent is the premier company in the venting industry. With a broad range of engineered venting products, DuraVent has earned its reputation as the industry leader by offering innovative, safe, and professional products for the HVAC and Hearth markets.

PolyPro and PVC/CPVC: PVC pipes are commonly used for venting water heaters, condensing boilers, and warm air furnaces. PolyPro is an engineered alternative for condensing gas appliances. Engineered for venting, it is easier and faster to install than PVC, saving the contractor time and money. Polypropylene has a higher operating temperature limit of 230°F/110°C (PVC is 149°F/65°C max and CPVC is 194°F/90°C). PolyPro is engineered with a condensation management system. 


  • Use to transition the vent system to a smaller diameter.
  • Includes 1 Locking Clamp.



PolyPro is a polypropylene vent pipe with ANSI Category II and IV gas-burning appliances, including high-efficiency water heaters, condensing boilers, and warm air furnaces. Intertek lists PolyPro to the ULC S636 standard in Canada as a Class IIA, IIB, and IIC vent system suitable for exhaust temperatures up to 230°F / 110°C, and a maximum positive pressure of 15 in-w.c.



    Model Dimension
    3PPS-R2L 3"-2" Diameter x 5" (A)
    4PPS-R3L 4"-3" Diameter x 5" (A)
    5PPS-R4L 5"-4" Diameter x 7.625" (A)
    6PPS-R5L 6"-5" Diameter x 7.75" (A)
    8PPS-R6L 8"-6" Diameter x 5.9375" (A)
    Clearance 0” clearance to combustibles / vertical installations
    Listings ULC S636 is Listed as a Class IIA, IIB, and IIC vent system.
    Warranty 10-years Limited warranty



    Warning: This product can expose you to Chromium, known in the state of California to cause cancer, congenital disabilities, or other reproductive harm. For more information, see CA Prop 65 Warning