I have a 7 inch dust collector inlet that I wish to reduce to a 6 inch pvc pipe, and would like to know if the 8 inch side seal to a 7 inch fitting?

Check the fernco.com website for the exact ID dimension, which is 8.51". Fernco says it will tighten down 5%, which is ~8.07". If the OD of your 7" pipe is about 8", then it should work. You can increase the OD of your 7" pipe by wrapping it with duct tape or some other material.

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🔧 Connect with confidence — the flexible coupling that means business!

COMPACT LIGHTWEIGHT - 1.4 kg design ensures easy handling and installation.
ROBUST PVC CONSTRUCTION - Engineered for long-lasting durability and corrosion resistance.
PRECISION FIT DIMENSIONS - 15.2 x 21.6 x 21.6 cm tailored for secure, leak-proof connections.
UNIVERSAL PIPE CONNECTOR - Seamlessly links any two pipes for hassle-free plumbing.
TRUSTED AMERICAN CRAFTSMANSHIP - Made in the USA by Fernco, a leader in plumbing solutions.

The Fernco 1056-86 Flexible Coupling is a high-quality, black-finished PVC connector designed to join 8" and 6" pipes effortlessly. Weighing just 1.4 kg and crafted in the USA, it offers a durable, corrosion-resistant solution ideal for drain applications, ensuring a secure and reliable plumbing connection every time.

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Size	8' x 6"
Material	Polyvinyl Chloride
Brand	Fernco
Colour	Black
Item dimensions L x W x H	15.2 x 21.6 x 21.6 Centimeters
Connector Type	Coupling
Exterior Finish	black
Thread Type	NPT
Item Weight	1.4 Kilograms
Number of Pieces	1
Global Trade Identification Number	00018578001664
Manufacturer	Fernco Inc.
UPC	018578001664
Country of Origin	USA
Item model number	1056-84
Product Dimensions	15.24 x 21.62 x 21.62 cm; 1.4 kg
ASIN	B000VZPZQI

Fernco 1056-86 Flexible Coupling - 8" x 6"

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