The MAXFLOW MIDLINE (MFML) is a straight, full-bore, pressure-balanced Hot Stab.

The MAXFLOW Hot Stab is the world’s first straight-through, pressure-balanced stab connector. It incorporates Secc’s patented MAXFLOW zero head-loss technology and is ideally suited to high-flow operations where a conventional API 17H hot stab of the same bore size is limited by relatively large pressure drops.

The balanced geometry provides the lowest pressure drop possible across any Hot Stab equivalent and zero axial hydrostatic force on the retention system.

The straight-through, full bore permits maximum flow at minimum pressure. A 1″ MAXFLOW performs the same as a 2″ conventional hot stab and a 2″ MAXFLOW the same as a 4″conventional hot stab.

Utilising the MAXFLOW, engineers are able to consider reducing the bore size or pressure rating of the subsea infrastructure. Additionally pumps, valves and other pressure related equipment can be appropriately sized. All of this can lead to significant cost and weight savings on subsea projects.

Secc’s pressure balanced geometry has been utilised for over 20 years.


  • All pumping and fluid transfer projects associated with subsea and topside applications
  • Well stimulation
  • Work over & intervention
  • Pressure testing
  • Pipeline pre-commissioning
  • Coil tubing
  • Kill lines
  • Cementing
  • Chemical injection
  • Gas injection
  • Subsea pigging


  • Straight through bore – zero head loss
  • Fully pressure balanced design
  • Very high flow rates achievable
  • Relatively low pressure drop
  • J-Latch alignment and locking mechanism
  • ROV or diver operable
  • Range of ROV handles
  • Dual seal arrangement
  • Push to connect, pull to disconnect
  • 25 year design life (Connector and seals)
Bore Sizes

1/4”, 1/2”, 1”, 2” and 4”

Design Pressure

Up to 15,000 psi [690bar]

Water Depth

Up to 10,000 ft. [3048m]

Operating Temperature

-18ºC to 121ºC

Flow Path

Straight-through, full bore with no restrictions to the flow path

Male & Female End Fittings

API Flange
Threaded (JIC or NPT)
Destec or Grayloc Hubs
H/P Autoclave
Weld Preparation
(Other end connections available)

Elastomeric Seals

HNBR, Viton (FKM) or Perfluoroelastomer (FFKM)


Super Duplex, Inconel and S316 Stainless Steel

Connection Methods

ROV - Fishtail, T-Bar, or Grab Handle
Manual Topside

Alignment Method

J-Type Latch

Disconnection Method

ROV Pull-Out

Breakaway Control

J-Type Latch

Dimensions & Weights

Please refer to individual data sheets

Flow Rates

For specific flow information, please contact Secc

Do you have an enquiry?