Hey science folks and lab technicians! If you're tired of dealing with worn-out rubber stoppers for your thermometer adapters, these StonyLab plastic screw caps are such a practical solution. You get 5 in a pack, which is perfect because these things always seem to disappear or get damaged when you need them most. The brilliant design fits three common adapter sizes: 14/20, 19/22, and 24/40 - so they're super versatile for various lab setups. Each cap has a 7mm diameter hole that accommodates thermometers or gas pipes measuring between 5.0-7.0mm, making them perfect for distillation equipment and other organic chemistry applications. Made from premium plastic material that's durable and can handle temperatures up to 150°C, which covers most standard lab procedures. The screw-mouth design is so much easier to work with than traditional rubber stoppers - no more struggling to insert thermometers or worrying about breaking glassware from too much pressure. They create a secure seal that's reliable for accurate measurements and safe vapor containment. Whether you're setting up distillation apparatus, reaction systems, or any equipment requiring thermometer insertion, these caps provide a modern, reusable alternative to old-fashioned rubber stoppers. The quality is solid for the price, and having 5 means you can equip multiple setups or have backups ready. Seriously, if you work in a lab setting regularly, these little caps will make your life so much easier and your equipment setups look more professional too!
Free 30-day returns 
Free 30-day returns
