Stainless Steel Tank Flex Hose

Underground petroleum tank applications are demanding and highly engineered and specified. Unisource has designed and constructed special flexible metal hose assemblies exclusively for this market. Our special connectors are U.L. listed and meet or exceed the recommended U.L. and U.L.C. pressure ratings.

We have connectors for any petroleum tank connection application– aboveground, sump, or underground. Our unique fitting designs such as our special male swivel fitting make installation of hoses quick and easy.


“FireGuard” Above & Below Ground Use

FireGuard Flexible Connectors

Unisource FireGuard Flexible Connectors are the workhorse of the industry in above ground, sump, and underground applications.

Unisource FireGuard is constructed using a super flexible corrugated stainless steel hose with stainless steel braid. FireGuard may be used in any tank connection application—above ground, sump, or underground. FireGuard meets all industry specifications for aboveground and underground applications.

FireGuard connectors are manufactured to exacting material and ASME welding standards and have been rigorously tested for pressure rating, temperature, motions, and fire rating. FireGuard connectors are UL listed and meet or exceed the recommended UL and ULC pressure ratings. All assemblies are 100% tested, utilizing helium leak method.

Easy to handle, install, and enable!

The stainless steel construction of the FireGuard connector is inherently corrosion resistant, resistant to aromatic vapor permeation, and offers a zero-permeation solution. The corrugated tube construction is rated for full vacuum service and complies with NFPA 30/30A codes. All connectors are shipped complete with installation instructions.

FireGuard connectors are easy to handle and install due to a special “hydro-forming” process that creates uniform wall thickness, enabling the finished assemblies to be extremely flexible.

The FireGuard assemblies are also designed to accept all approved secondary containment systems.

Choose from a variety of end fittings, including rigid male NPT, female NPT, male swivel, Quick Fit, BSPP and BSPT. Available in lengths up to 96 inches overall.

End Fittings
Pressure Range
Vacuum Rating
Stainless steel annular close-pitch corrugations. Highly flexible Rigid male NPT, female NPT, male swivel NPT. Other end configurations available 150 PSIG 3/4″ through 3″ Type 304 stainless steel single braid 12″, 15″, 18″, 24″, 30″  Full vacuum

Note:  Working pressure changes to 50 PSIG when using integral hex swivel fittings

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