#7 stopper - with 3/8 inch hole. Top diameter 1.43 inches (36.3 mm), bottom diameter 1.19 inches (30 mm), length 1 inch (25 mm).
Used with or without an airlock, this #7 Silicone Stopper With Hole is an essential accessory for your glass carboy.
This #7 Stopper With Hole fits our 5, 6, and 6.5 gallon glass carboys. It can be used with an airlock or without, by simply using a #000 solid stopper (FE400) to plug/unplug the hole. Easy to clean and sanitize. Size - 1 3/16" - 1 8/16".