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Stainless Steel Duolok Tube Fitting, Inch Tube OD Plug

Description & Features

The SSP 316 stainless steel Duolok plug is engineered to offer a reliable leak-proof connection in a wide range of instrumentation and process tubing systems. The double ferrule design effectively compensates for variations in tubing materials and wall thickness.

Duolok tube fittings are gaugeable upon installation and guarantee high-quality performance. Straight fittings are precision-machined from type 316 stainless steel cold-finished bar stock per ASTM A-276 and ASTM A-479 while shaped bodies are produced from close-grained 316 stainless steel forgings according to ASTM A-182. All components are heat code traceable and certified material test reports (CMTRs) are available.

Designed and manufactured to be fully interchangeable with Swagelok brand tube fittings the Duolok line ensures compatibility across different systems. These fittings handle pressures equal to the maximum allowable working pressures of the recommended stainless steel tubing.

Operating reliably in a wide range of temperatures Duolok tube fittings may experience reduced maximum working pressures at elevated temperatures. For specialized applications consult for assistance. Refer to safety guidelines for appropriate selection of tubing and tube fittings.

Supplier Part Number: ISSD16P

Specifications

Brand Ssp Fittings Corp	Brand SSP Fittings Corp	Pack Size 1.00	UOM EA	Supplier Part Number ISSD16P	Alternate Part Numbers Alternate Part Number C1KG18	Product Weight 0.30 lbs

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ISSD16P Stainless Steel Duolok Plug

Product Questions & Answers (3)

Question by: Rod J on Apr 22, 2025, 6:53 PM

Will this plug hold up okay in a hydraulic system runnin' around 2000 PSI? Don't wanna blow a seal or nothin'.

Answer by: Customer Support on Apr 24, 2025, 12:08 PM

Duolok fittings like this one are generally rated for pressures equal to the maximum allowable working pressures of the stainless steel tubing recommended for use with them.

Question by: Steve H on Jul 23, 2025, 1:01 PM

got a 1 inch stainless tube line, is this the right plug to cap it off?

Answer by: Customer Support on Jul 25, 2025, 6:01 AM

For a 1 inch tube outside diameter line, this Duolok plug is the matching size. It is a double ferrule stainless tube fitting meant to make a leak tight cap in instrumentation and process tubing systems.

Question by: Kent P on Feb 25, 2026, 6:32 AM

these duolok plugs interchangeable with swagelok fittings or do I need to order specific parts for each brand?

Answer by: Customer Support on Feb 27, 2026, 8:11 AM

Fully interchangeable with Swagelok brand tube fittings. The Duolok line is manufactured and quality controlled to meet that standard, so you can mix them into an existing Swagelok system without any fitment issues.