The SQuape A[rise] has the following sizes including base but without mouthpiece and without 510 connection:
4ml Standard and Triangle: 39.7mm
PSU (polysulfone) is very durable and is used in medicine, biotechnology and food preparation. PSU is much more resistant to tank cracker liquids than e.g. PMMA. However, even this material is not completely resistant to all aromas. StattQualm is not liable for tanks damaged by liquids and aromas. We generally recommend cleaning the tanks with cool water if necessary.
If you want to change the filling quantity of your existing SQuape A[rise], you need the corresponding chimney. The 4ml Standard and the 4ml Triangle PSU Tank are compatible with the same chimney.