Prior Tree Caps generally require specific radial alignment of the Tree Cap in order to be inserted and secured in the Subsea Tree. The alignment of the Tree Cap to a particular radial alignment is difficult when installing a Tree Cap with an ROV. This particular Tree Cap is designed in such a way that an ROV can install it into a Subsea Tree at any rotational orientation. The Figure-1 shows the cross-section of the Tree Cap showing the Annulus and Production Bores, also the Tree Cap being run, landed and locked into a Subsea Tree. A Centralizer is used to align the Tree Cap with the Production Bore. - See more at: http://www.rigzone.com/news/oil_gas/a/79248/Aker_Solutions_Develops_ROV_Tree_Cap_to_Improve_Offshore_Technology#sthash.Nsn1jey8.dpuf