Which Seal Kit Fits Your Underwater Phone Housing? Start With the Seal Location

A spare seal kit for a phone housing can contain two different pieces. Before buying one for a snorkeling trip, identify which opening you are asking about. A large seal around the housing and a small seal at a port occupy different positions and need to be matched to the exact housing.

Find the diagram for the model on your label

For the SportDiver S SL408, the SeaLife English owner manual identifies two distinct seals, one at the main closure and one at the vacuum check port. Its replacement section names the O-ring set as SL40010. Use the named set and the labeled locations when asking a dealer which part you need. A photograph of a loose rubber ring gives a dealer less information than the housing code and the location in the diagram.

The SeaLife manual for SportDiver SL400-U also identifies the main seal and the vacuum check port seal and lists SL40010. Those matching references cover the exact models named in the two documents. For another housing version, find its own instructions before assuming the same package applies. Keep a copy of the model’s diagram beside your equipment list.

Check what the replacement set actually includes

In your order request, state the manufacturer, housing code, identified seal position and set reference. Ask whether the quote is for both pieces or one part, whether the part number has been superseded and which exact model documentation the seller is using. If a quote combines two items, ask which piece serves which opening so you can compare it with the diagram.

If a seal is damaged or the housing has shown an abnormal test result, ask the maker or dealer to assess the entire housing under its instructions. Keep it out of water use until the question is resolved. A spare seal does not establish the condition of the surface it seals against or supply a successful check of the complete housing.

The TRIMIX camera housing guide addresses a separate accessory interface. Prepare a TRIMIX equipment inquiry with the exact model and part position if you have a product question.

Evidence checked November 12, 2026. Evergreen spare-part guide. The two linked editions are marked April 2025 and June 2023. By TRIMIX Sports.