GR6POCR8GA26D
Greenseam Duct Collar w/Damper 10 in W,
You will like that the CPC1G Ceramic Pourable Compound can be poured into deep cavities.
GREENSEAM GR6POCR8GA26D Damper, Self Seal Collar, 8" Diameter, 26 Gauge
The ICS brand is a common sight in professional repair shops.