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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Description

🔧 Connect with Confidence — The Last Coupling You'll Ever Need!

LEAK PROOF CONFIDENCE - Designed to resist chemicals and sewer gases, ensuring a watertight, odor-free seal every time.
CERTIFIED CODE COMPLIANT - Meets ASTM, CSA, and UPC standards for professional-grade reliability and peace of mind.
BUILT TO LAST HALF A CENTURY - Engineered for a 50-year service life with premium elastomeric PVC for unmatched durability.
UNIVERSAL PIPE COMPATIBILITY - Seamlessly connects cast iron, plastic, steel, copper, and lead pipes for versatile applications.
EFFORTLESS NO MESS INSTALLATION - Forget primers and glues—install quickly with corrosion-resistant stainless steel clamps using just a screwdriver.

The Fernco 1056-86 Flexible Pipe Coupling is a robust, 8" to 6" reducer made from elastomeric polyvinyl chloride, designed for a 50-year lifespan. It fits a wide range of pipe materials including cast iron, plastic, steel, copper, and lead. Featuring corrosion-resistant stainless steel clamps, it offers quick, no-mess installation without primers or glues. Certified to ASTM, CSA, and UPC standards, this coupling guarantees a leak-proof, chemical- and sewer gas-resistant connection ideal for sewer, drain, waste, and vent piping.

Specifications

Size	8" x 6"
Material	Polyvinyl Chloride
Brand	Fernco
Color	Black
Item dimensions L x W x H	6 x 8.51 x 8.51 inches
Connector Type	Reducer
Exterior Finish	Stainless Steel
Thread Type	NPT
Item Weight	1.4 Kilograms
Number of Pieces	1
Global Trade Identification Number	00018578001664
Manufacturer	Fernco Inc.
UPC	018578001664
Part Number	1056-86
Item Weight	3.08 pounds
Product Dimensions	6 x 8.51 x 8.51 inches
Item model number	1056-84
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Measurement System	inch
Batteries Included?	No
Batteries Required?	No

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