Duolok – Interchangeable with Swagelok

What is Duolok?

Duolok is a series of instrument tube fittings introduced by the SSP Corporation. Unlike most standard tube fittings, which are built from 3 component pieces, Duolok tube fittings are built with 4 components: body, front ferrule, back ferrule, and nut.

Duolok Tube Fittings

This double ferrule construction is designed to provide leak-tight performance for analytical and process instrumentation instruments that require a high level of reliability.

A leak in a tube fitting can cause unwanted delays, malfunctions in equipment, and a loss of revenue, and the SSP Duolok fitting is specifically designed to ensure proper functioning.

To further increase reliability, SSP has revolutionized the fitting industry by stamping each Duolok fitting with the Maximum Allowable Working Pressure (MAWP). An overload of pressure can damage equipment and result in bodily injury.

This fitting stamp makes pressure tolerances easily identifiable, so there will not be any guesswork involved. Duolok fittings are individually packaged by SSP in protective plastic bags to prevent the components from getting damaged or contaminated by oils or debris.

SSP Duolok® Fittings are Interchangeable with Swagelok® Brand Tube Fittings

Interchangeability is an important part of instrumentation and tube fittings and SSP has taken this into account when producing the Duolok tube fittings. An incorrect fitting can lead to leakage in the process tubing system, which can cause component malfunctions and increase the chances of system failure.

With this in mind, SSP has designed the Duolok® system to be completely interchangeable with the Swagelok® brand of tube fittings and they are completely “component intermixable”.

Duolok® fittings are identical in both size and construction to Swagelok® tube fittings, and are built using the same high quality materials. To further decrease the likelihood of failure, both the Duolok and Swagelok tube fittings are manufactured with the same precision tolerances and are subjected to rigorous quality control procedures.

Visit Omni Services Instrumentation Division for more Instrument Tube Fittings:

About SSP Fittings Corporation

The SSP Corporation was established in Cleveland, Ohio in 1926 as a manufacturer of screw machine products. When World War II began, the SSP Corporation discontinued production of screw machine parts and began making fittings for tube, piping, and hose products instead. By the end of the twentieth century SSP had become one of the world’s foremost producers of instrument tube fittings.

In addition, SSP has introduced several of its own brands, including Duolok, Unilok, and Griplok. Today, SSP Corporation continues to be a leader in the industry, specializing in stainless steel and nickel-based alloy fluid components and offering quick delivery services.

Omni Services, Inc. is an authorized distributor of SSP Duolok Tube Fittings and can help you with your process system needs. Call us @ 1-800-229-2778 and one of our fluid conveyance specialists will be happy to assist you.