Rubber Stoppers for 800mL Kjeldahl Flasks

Light tan rubber stoppers

Twistit: Four Stoppers in One Products for Science Education

Multi-purpose and economical

Rubber Stoppers for Kjeldahl Flasks

Light tan rubber stoppers

Plasticoid Walter Crucible Holder

Rubber with removable glass stem ground at 45° angle

Walters Crucible Holder Products for Science Education

High-quality holder.

Plasticoid Crucible Holders

Holders for glass crucibles

Plasticoid Neoprene Flask Support

Remains useful even after long exposure to moderate heat

Stopper Assortments Products for Science Education

Soft, durable, resilient rubber designed for long life.