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Plugs & Caps

We specialise in many hose fittings including plugs and caps, available in brass, stainless and galvanised steel for BSP and metric threads.

  • REF #1399

    BSPT Allen Key Plug

    BSPT Allen Key Plug

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    £0.76 INC VAT
    £0.63 EXC VAT

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  • REF #1401

    BSPP Allen Key Plug - O Ring - Nickel Plated

    BSPP Allen Key Plug - O Ring - Nickel Plated

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    £0.89 INC VAT
    £0.74 EXC VAT

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  • REF #1397

    BSPP Allen Key Plug - Nickel Plated

    BSPP Allen Key Plug - Nickel Plated

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    £0.91 INC VAT
    £0.76 EXC VAT

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  • REF #1408

    Female BSPP Cap - Nickel Plated

    Female BSPP Cap - Nickel Plated

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    £1.07 INC VAT
    £0.89 EXC VAT

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  • REF #1390

    BSPP Male Plug - Nickel Plated

    BSPP Male Plug - Nickel Plated

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    £1.13 INC VAT
    £0.94 EXC VAT

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  • REF #1396

    BSPT Allen Key Plug - Steel

    BSPT Allen Key Plug - Steel

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    £1.33 INC VAT
    £1.11 EXC VAT

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  • REF #1407

    Female BSPP Cap

    Female BSPP Cap

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    £1.12 EXC VAT

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  • REF #1924

    BSPT Beaded Hollow Plug - Galvanised

    BSPT Beaded Hollow Plug - Galvanised

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  • REF #1387

    BSPP Hexagonal Hollow - Nickel Plated

    BSPP Hexagonal Hollow - Nickel Plated

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    £1.46 EXC VAT

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  • REF #1400

    BSPP Allen Key Plug

    BSPP Allen Key Plug

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    £1.75 INC VAT
    £1.46 EXC VAT

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  • REF #1393

    Male Metric Hexagonal Plug

    Male Metric Hexagonal Plug

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    £1.82 INC VAT
    £1.52 EXC VAT

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  • REF #1389

    BSPP Hexagonal Plug - Solid - Nickel Plated

    BSPP Hexagonal Plug - Solid - Nickel Plated

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    £1.92 INC VAT
    £1.60 EXC VAT

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  • REF #1395

    Male BSPP Square Headed Plug

    Male BSPP Square Headed Plug

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    £1.62 EXC VAT

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  • REF #1384

    BSPT Hexagonal Plug - Solid

    BSPT Hexagonal Plug - Solid

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    £2.05 INC VAT
    £1.71 EXC VAT

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  • REF #1388

    BSPP Hexagonal Plug - Solid

    BSPP Hexagonal Plug - Solid

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    £1.71 EXC VAT

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  • REF #1405

    Air Vent - Manually Operated

    Air Vent - Manually Operated

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Pipe plugs and caps for sealing ports and line ends

Plugs and caps do the same job from opposite sides of a fitting. A plug is male-threaded and screws into a female port to seal it. A cap is female-threaded and goes over a male fitting or pipe end to protect it from contamination or seal it off.

The most common use is sealing unused ports on valves, manifolds and hydraulic blocks. Any open port in a pressurised system is a potential leak point, and on systems that sit idle between uses it is also an entry point for contamination. The right plug, correctly torqued with the appropriate sealant or PTFE tape, closes that off.

Caps are often used to protect male fittings during storage or shipping, and to blank off lines during maintenance when a component has been removed and the system needs to stay clean.

Brass is the standard material for most hydraulic, pneumatic and water applications. Steel plugs are used on higher-pressure hydraulic systems. Nylon caps work well for dust and contamination protection where no pressure is involved.

Thread sizes cover BSP and metric. If you need to seal multiple ports on a manifold or valve block, buying in a small quantity is more economical than ordering one at a time.

Frequently Asked Questions

What is the difference between a pipe plug and a pipe cap?

A plug is male-threaded and seals a female port from the inside. A cap is female-threaded and goes over a male fitting or pipe end to seal it from the outside. Both achieve a seal — the choice depends on which side of the port you are working from.

What material plug should I use for a hydraulic system?

Brass works for most general hydraulic applications. Steel is the better choice on high-pressure hydraulic circuits where thread strength is a factor. For any system carrying more than 250 bar, verify the pressure rating of the fitting before installation.

Can I use a plug to seal an unused port on a valve body?

Yes. Plugs are one of the most common ways to blank off unused ports on valve bodies and manifolds. Use thread sealant or PTFE tape appropriate to the medium, and torque to the fitting manufacturer's specification.

Do you deliver pipe plugs and caps near me?

Yes. We deliver across England and Wales with free delivery on orders over £200. Individual fittings and small quantities are fine — no minimum order applies.