Will the openings stretch overtop of a connector?

The diameter of the spring coil is 3 in, and the PVC and foil liner is a little bit inside of this. I was able to stretch the liner and get the connector inside, but it might be worth going with the next size up.

Is this UL approved for dryer venting?

No. I wouldn’t use this. Higher temperature applications require a different flex usually all aluminum for dryer venting because of the moisture levels being exhausted.

What is the inner diameter ? will this fit to 3" pvc ? i am trying to use it for the intake and outtake of tankless water heater

Inner diameter is 75mm, fit to 3"

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🖤 Flex your airflow game with silent, durable, and lightproof ducting!

BUILT TO LAST - 3-layer aluminum foil, PET, and steel wire helix resist rips and pinholes
LIGHTPROOF DESIGN - Black PVC layer blocks light leaks, perfect for grow rooms & sensitive spaces
WHISPER QUIET VENTING - Cut fan noise by up to 50% for a peaceful environment
FLEXIBLE FIT EASY INSTALL - Slides effortlessly onto 3" ducts, vents, and filters—no hassle setup
VERSATILE AIRFLOW SOLUTION - Ideal for HVAC, dryers, grow tents, kitchens, and bathrooms

The Hon&Guan 3" x 8FT Insulated Flexible Duct Hose features a 3-layer construction with aluminum foil, PET, and steel wire for durability and shape retention. It reduces fan noise by up to 50%, blocks light leaks with a thick black PVC layer, and fits standard 3" ventilation systems. Easy to install and versatile, it’s perfect for HVAC, dryer vents, grow rooms, and more.

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Manufacturer	Hon&Guan
Part number	Hon&Guan
Item Weight	259 g
Product Dimensions	243.84 x 7.62 x 0.1 cm; 259 g
Manufacturer reference	Hon&Guan
Size	3 x 8 FT
Color	Black
Material	Polyvinyl Chloride (PVC)
Included components	2PCS Clamps, 3*8FT Duct Hose
Batteries Included?	No
Batteries Required?	No

Hon&Guan 3" x 8FT Insulated Duct with Aluminum Foil, Flexible Dryer Vent Hose for HVAC Ventilation and Duct Fan Systems, 2 Clamps Include

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