I have an existing pipe 3" interior and 3.5" exterior. what size coupling and termination vent do i need?

All 3" pipe is 3.5" O. D., otherwise it is not 3" pipe; I. D. will vary due to pipe thickness or schedule. Schedule 40 3" pipe is 3" I. D. Signed, a Pipe Fitter.

PVC DWV fittings are for nonpressurized applications and are not rated Schedule 40

I have a 3" pipe which is 3.5" on the exterior, is this 3" elbow going to fit? Other seller I purchased from was opposite of expected.

Yes it worked for me. I put it together with 3-1/2" exterior abs and it fit perfectly.

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↪️ Elevate your plumbing game with precision and durability! 🛠️

LIGHT AS A FEATHER - PVC construction means less weight, easier handling, and faster installation
SMOOTH INTERIOR FINISH - Optimized for minimal friction and reduced buildup, ensuring peak flow efficiency
CORROSION RESISTANT PVC - Built to withstand harsh environments without rust or degradation
SEAMLESS 90 DEGREE FLOW - Effortlessly redirect piping with precision-engineered elbow design
CERTIFIED QUALITY ASSURANCE - Meets ASTM D2665 & D3311 standards for trusted, professional-grade performance

The NIBCO Fig No U4807 is a 1-1/2 inch PVC DWV 90-degree elbow hub designed for drain, waste, and vent systems. Featuring corrosion-resistant PVC material, it offers a lightweight yet strong alternative to metal fittings. Its smooth interior reduces friction and buildup, ensuring efficient flow. Certified to ASTM D2665 and D3311 standards, this fitting guarantees professional-grade quality and reliability for residential and commercial plumbing applications.

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