The Water Polo 4x4 Competition Rules — in force from February 2026 as a standalone set of rules.
| In force from | February 2026 |
| Length | 27 pages |
| Status | This set replaces Appendix 9 of Part Six of the Competition Regulations |
Water polo 4x4 is a shortened format of water polo, and its rules were previously an appendix within the Competition Regulations. The federation has turned them into a standalone set, and the document itself states that it supersedes that appendix. Citations should refer to this text, not to Appendix 9.