European foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Designation
5 Symbolization
6 Materials
7 Requirements
8 Marking (not required for site constructed products)
9 Technical documents
Annex A (informative) - Relationship between h and l for air gap
Family A, Type B with rectangular overflow
Annex B (normative) - Alternative overflow arrangements
Annex C (normative) - Vacuum Test