It's okay. You really need to seal or glue them when using an airlock. I have used silicone bushings before but ordered them for the price. The silicone is definitely worth the extra cost and I plan to order more silicone to replace them.
WINKINE Acrylic Riser Display Shelf: Versatile 4-tier Organizer for Perfumes, Amiibo and Funko POP Figures
28 Review
Giftgarden Woodgrain Picture Ledge Shelf Set - 24 Inch Black Floating Shelves for Storage in Home and Office, Set of 3 Different Sizes
27 Review
π Bellamei Extra Large Reusable Brew Bags - 2 Pack, 250 Micron Fine Mesh Bags for Fruit Cider Apple Grape Wine Press Straining, Drawstring Brew in a Bag (2 pack-22"Γ26")
27 Review
24-Inch Musical Christmas Tree With Charlie Brown & Linus Blanket - ProductWorks
37 Review
AmazonBasics Silicone Baking Mat Sheet
48 Review
300PCS Pre-Cut Unbleached Parchment Paper Sheets - Perfect For Baking, Grilling, Air Fryer & Steaming!
36 Review
2-Pack European Grade Silicone Bunte Cake Pan Set - Non Stick Bakeware Fluted Tube Mold For Jello, Gelatin & Cakes | 9 Inch Baking Pans | Aokinle | BPA Free
38 Review
PME Scriber Needle Modelling Tool, For Cake Decorating, 5.7-Inch
38 Review