DGDG-EU service line J tube seals:

J-tube seals are designed to act as a seal and corrosion inhibitor between service lines and J-tubes on offshore platforms.

Three designs of J-tube seal are available.
1) Pull in type - This type of seal is basically an interference fit and forms a seal at the pull in stage.
2) ROV activated - The seal is located by the pull in process with more accurate location overseen by ROV the seal is activated by ROV.

The two diverless designs are pre-installed prior to deployment.

3) Diver installed - This seal type is installed and activated after service line deployment and is designed for retrofit applications.
J Tube seals comply with API 17J.

J Tube seals