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Ralston Instruments - Calibration Hoses & Fittings

Make a bubble-tight connection, over and over again, without a wrench.

Ralston Quick-test hose and adapters seal via an O-ring and probe. The probe slides into the O-ring and provides the seal while the threads keep the probe in place. This simple and reliable method allows for leak-free connections for pressure calibration, gas sampling, pressure reading and testing.

The specialist tube fittings adapt the Quick Test system to any Swagelok, Parker, Hoke, SSP, Tylok or equivalent tube fitting. They feature a unique design that seals on an o-ring to prevent damage to a tube fitting, allowing you to make and remake the connection hundreds of times without over-tightening a tube fitting.

If you can't find a suitable item or if you need some help or advice, please don't hesitate to contact us. With over 25,000 products in our catalogue we'll be able to find a solution that's right for you.

Items 11 to 20 of 54 total

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  1. Ralston QTHA-CCBU Quick-Test Female Union (Brass)

    Ralston QTHA-CCBU Quick-Test Female Union (Brass)

    FQT x FQT (Brass)

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  2. Ralston QTHA-4TB0 Quick-Test Male x 1/2" Tube Female (Brass)

    Ralston QTHA-4TB0 Quick-Test Male x 1/2" Tube Female (Brass)

    Suits Ralston Calibration Hoses

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  3. Ralston QTHA-3TB0 Quick-Test Male x 3/8" Tube Female (Brass)

    Ralston QTHA-3TB0 Quick-Test Male x 3/8" Tube Female (Brass)

    Suits Ralston Calibration Hoses

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  4. Ralston QTHA-2TB0 Quick-Test Male x 1/4" Tube Female (Brass)

    Ralston QTHA-2TB0 Quick-Test Male x 1/4" Tube Female (Brass)

    Suits Ralston Calibration Hoses

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  5. Ralston QTHA-2FBA Quick-Test Female x 1/4" NPT Female (Brass)

    Ralston QTHA-2FBA Quick-Test Female x 1/4" NPT Female (Brass)

    Suits Ralston Male Adaptors

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  6. Ralston QTHA-1FBA Quick-Test Female x 1/8" NPT Female (Brass)

    Ralston QTHA-1FBA Quick-Test Female x 1/8" NPT Female (Brass)

    Suits Ralston Male Adaptors

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  7. Ralston QTHA-6FB0 Quick-Test Male x 3/4" NPT Female (Brass)

    Ralston QTHA-6FB0 Quick-Test Male x 3/4" NPT Female (Brass)

    Suits Ralston Calibration Hoses

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  8. Ralston QTHA-4FB0 Quick-Test Male x 1/2" NPT Female (Brass)

    Ralston QTHA-4FB0 Quick-Test Male x 1/2" NPT Female (Brass)

    Suits Ralston Calibration Hoses

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  9. Ralston QTHA-3FB0 Quick-Test Male x 3/8" NPT Female (Brass)

    Ralston QTHA-3FB0 Quick-Test Male x 3/8" NPT Female (Brass)

    Suits Ralston Calibration Hoses

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  10. Ralston QTHA-3FB1 Quick-Test Male x 3/8" NPT Female (Brass, Check Valve)

Items 11 to 20 of 54 total

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