A retrievable module suitable for a seabed processing system

A retrievable fluid separation module (2) for a seabed processing system (1) to which external flow lines are connected includes a first portion (60) of a multi-ported valve isolation connector (5) and a separator chamber (6) for separating a plurality of fluids from a received fluid mixture. The separator chamber has an inlet flow line (8) and an outlet flow line (15,16) for each separated fluid. The flow lines are connected to the first portion of the connector (5) which selectively isolates the module from or connects it to the external flow lines by means of a second complementary portion (61) of the multi-ported valve isolation connector with which the first portion (60) is adapted to engage. One of the outlet flow lines (16) has a modulating valve (25) for controlling flow therethrough and a control unit (29) in the module operates the valve (25) via a control actuator (63).