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 Last Coupling You'll Ever Need!

BUILT TO LAST - Engineered for a 50-year service life with premium elastomeric PVC for unmatched durability and leak-proof performance.
CERTIFIED RELIABILITY - Meets ASTM D 5926, C 1173, CSA B602, and UPC standards, guaranteeing trusted performance for professional-grade projects.
EFFORTLESS INSTALLATION - No primers, glues, or odors—install quickly with just a screwdriver or torque wrench for a mess-free experience.
UNIVERSAL COMPATIBILITY - Seamlessly connects diverse pipe materials including PVC, cast iron, steel, copper, and more for versatile plumbing solutions.
CORROSION RESISTANT CLAMPS - 300 stainless steel clamps ensure rustproof, secure fittings that stand the test of time and harsh environments.

The Fernco 1056-86 Flexible Pipe Coupling is a professional-grade plumbing connector designed to join 6" to 8" pipes of various materials including cast iron, plastic, and steel. Crafted from durable elastomeric PVC and equipped with corrosion-resistant stainless steel clamps, it offers a 50-year service life with leak-proof, chemical-resistant performance. Easy to install without messy adhesives, it meets multiple industry standards, making it the go-to choice for contractors and municipalities seeking reliable, long-lasting pipe connections.

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€ 267.22

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Manufacturer	Fernco Inc.
Part number	1056-86
Item Weight	1.4 Kilograms
Product Dimensions	15.24 x 21.62 x 21.62 cm; 1.4 kg
Item model number	1056-84
Size	8" x 6"
Color	Black
Material	Polyvinyl Chloride
Item Package Quantity	1
Number Of Pieces	1
Measurement System	inch
Batteries Included?	No
Batteries Required?	No

Fernco 1056-86 Flexible Pipe Coupling 8” CI/Plastic/Steel to 6” CI/Plastic/Steel

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