Stainless steel ringed lid to fit 9, 22 and 28 Litre unstirred baths.

Each lid hole is 114mm diameter with a ring set made up of concentric rings.

By fitting or removing each ring from the centre outwards reveals varying apertures 31, 43, 59 and 79mm diameter. This allows a variety of beakers or erlenmeyer flasks to be placed directly onto the shelf in the water bath.

In use the lid minimises evaporation and maintains temperature stability of the water bath when tall vessels are being heated at elevated temperatures.