The top measures 1 5/16″ and the bottom measures 1 1/16. These fit most standard glass fermenters! Fits almost all gallon jugs, 3 gal glass Carboys, and 5 gal glass Carboys.
- #6.5 rubber stopper with 3/8in hole
- Provides and excellent grip and air-tight seal on glass and PET surfaces even when wet
- Ideal Fit: 1-1/4in (31mm)
- Top Diameter: 1-5/16in (34mm); Bottom Diameter: 1-1/16in (27mm) Length: 1in (25mm) Hole Diameter: 3/8in (10mm)
- Food-grade and BPA-free