Dry Disconnect Couplings

Mann Tek Dry Disconnect Couplings are used for handling and transfer of liquids, gases and bulk powder in an economical, safe and environmental friendly way. Dry Disconnect Couplings are available in sizes from 3/4” up to 6” and in a wide range of materials and seals to be the given choice for almost any application.

The self sealing design of the couplings guarantees both the highest level of safety and also the quickest way of connecting and disconnecting.

The Coupling Function

The principle of operation is similary for all types of Mann Tek Couplings

To connect
Push and Turn

  • It's coupled
  • Full flow

To disconnect
Turn and Pull

  • It's released
  • No spillage


The couplings are available with BSP- and NPTthreads in sizes 3/4" (DN 20) to 6" (DN 150). Other threads are available on request (S60X6, Acme etc.). The tank units and Hose units are also available in flanged connections (DIN, ANSI, TW, TTMA, EN 1092-1:2001).


Aluminium, Brass/Gunmetal, Stainless Steel, Hastelloy C and PEEK. Other materials on request.


FPM (Viton®), EPDM, Chemraz®, Kalrez®, NBR (Nitrile). Other materials on request.

Maximum Working pressure:

MWP PN 10/16/25.
MAWP 150/300 psi

Test Pressure:

15/24/38 bar
225/450 psi

Selectivity - Avoid Mixing Products:

To avoid product contamination caused by connecting a Hose unit to the wrong Tank unit, selective versions of the Hose and Tank units are available. Each unit has a number of selective positions, designated by a coded part number according to the coupling size.

Electrical Conductivity

All DDCouplings® have electrical conductivity (<10 ohms).


Compatibility with other existing brands according to NATO STANAG 3756 and ATOFINA SGM 2049.TUY.C.

Special Models:

With integrated break-away, pressure relief valve, etc. on request.

Pressure Relief Valve in STANAG 3756 Tank Unit

This system dissipates trapped fluid pressure into hose coupler without spillage, to allow easy connection.

Trapped liquid in Tank Unit

Open pressure relief valve
Pressure expands into Hose Unit

Open without pressure
Full flow

Advantages Of DD Couplings

  • Easy to handle
    Push and Turn - free flow.
    Turn and Pull - closed.
  • Time saving
    No need to drain hoses or pipe systems.
  • Economical
    No loss or spillage of liquids at connection or disconnection.
  • Safe
    The valve cannot be opened until the unit is coupled.
  • Environmentally friendly
    Accidental spillage eliminated.
  • Reliability
    No loss or spillage of liquids at connection or disconnection.

Rail Tankers (RTC) and Dry Disconnect Couplings.

2", 3" and 4" Dry Disconnect Couplings for transfer of liquids from manufacturing plants to RTC such as Ammonia, Acrylonitrile, Propylene Oxide, Ethylene Oxide, Benzene, Ethanol, Jet fuel e.t.c.

The RTC´s are (off)loaded by loading arms or hoses equipped with Dry Disconnect Coupling Hose units. Size 1" for sampling, 2" for vapour recovery and 3" or 4" for liquid lines.

Most common material used is Stainless Steel with a wide variety of seals.


Home     |     About us     |     Our Products     |     Contact us

Copyright © 2024 All rights reserved.

design by











Copyright © 2024
All rights reserved.

design by