We have been working side by side with customers for nearly 25 years fabricating custom glassware to suit their needs. Whether it is a completely custom item or a custom modification to an existing catalog item we are happy to accommodate you. Just provide us with a blueprint or even a simple hand drawing will do and we are happy to help.

Three Neck Round Bottom Flasks for Reflux and Reaction Work

North Jersey Custom Glass fabricates three-neck round-bottom flasks built for reflux, addition, and multi-step reaction setups where a single neck simply is not enough workspace. The extra necks let you run a condenser, thermometer, and addition funnel simultaneously, which is why these flasks are a staple in chemistry, pharmaceutical, and academic labs. We stock popular joint sizes and capacities, and because every flask is hand-blown in-house, we can also produce custom joint configurations or capacities that are not part of a standard catalog listing.

Custom Sizes, Fast Nationwide Shipping

If the three-neck round-bottom flask you need isn’t listed on our site, just send us a blueprint or a simple hand drawing, and we’ll fabricate it to your specifications. We carry a large inventory of stock glassware, so most standard orders ship quickly, and our repair team can restore a chipped or cracked flask to near-new condition rather than requiring a full replacement. With nearly 25 years of experience in scientific glassblowing, North Jersey Custom Glass is equipped to handle both everyday replacements and highly specialized reaction glassware. Whether you order one flask or a full production batch, our team is ready to help.

Three-neck flasks are also a good fit for applications that call for controlled addition of reagents while monitoring temperature and maintaining an inert atmosphere, such as Grignard reactions or other moisture-sensitive chemistry. We fabricate them in round-bottom and flat-bottom styles, with joint angles arranged to keep your setup ergonomic on a standard lab bench. If your process changes over time, we can also modify an existing flask — adding or repositioning a neck — rather than starting a new piece from scratch.