3mirrors engine air valve holder assembly for versatile engine valve work
3mirrors engine air valve holder quick connector enables fast setup
3mirrors engine air valve holder hose 3/8 inch I.D. for reliable airflow testing
3mirrors engine air valve holder 1/4 NPT interface for easy spark plug access
3mirrors engine air valve holder LS engine compatibility for gasoline vehicles
3mirrors engine air valve holder spark plug location attachment for pressure testing
3mirrors engine air valve holder pressure range up to 300 PSI for diagnosis
3mirrors engine air valve holder applications across cars boats motorcycles ATVs
3mirrors engine air valve holder diagnostic leaks by sound during compression
3mirrors engine air valve holder assembly for versatile engine valve work
3mirrors engine air valve holder quick connector enables fast setup
3mirrors engine air valve holder hose 3/8 inch I.D. for reliable airflow testing
3mirrors engine air valve holder 1/4 NPT interface for easy spark plug access
3mirrors engine air valve holder LS engine compatibility for gasoline vehicles
3mirrors engine air valve holder spark plug location attachment for pressure testing
3mirrors engine air valve holder pressure range up to 300 PSI for diagnosis
3mirrors engine air valve holder applications across cars boats motorcycles ATVs
3mirrors engine air valve holder diagnostic leaks by sound during compression

3mirrors Engine Air Valve Holder – Pressure Pipe Kit (M10/M12/M14/M18 to 1/4 NPT) for LS Engines

Overview The 3mirrors Engine Air Valve Holder Pressure Pipe Kit is designed to support LS engine work...
Vendor: 3mirrors
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£33.36
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3mirrors engine air valve holder assembly for versatile engine valve work

3mirrors Engine Air Valve Holder – Pressure Pipe Kit (M10/M12/M14/M18 to 1/4 NPT) for LS Engines

£33.36
3mirrors engine air valve holder assembly for versatile engine valve work
3mirrors engine air valve holder quick connector enables fast setup
3mirrors engine air valve holder hose 3/8 inch I.D. for reliable airflow testing
3mirrors engine air valve holder 1/4 NPT interface for easy spark plug access
3mirrors engine air valve holder LS engine compatibility for gasoline vehicles
3mirrors engine air valve holder spark plug location attachment for pressure testing
3mirrors engine air valve holder pressure range up to 300 PSI for diagnosis
3mirrors engine air valve holder applications across cars boats motorcycles ATVs
3mirrors engine air valve holder diagnostic leaks by sound during compression

3mirrors Engine Air Valve Holder – Pressure Pipe Kit (M10/M12/M14/M18 to 1/4 NPT) for LS Engines

£33.36
Description
Description
x

Overview

The 3mirrors Engine Air Valve Holder Pressure Pipe Kit is designed to support LS engine work with a versatile set of adapters. Four thread options (M10, M12, M14, M18) convert to 1/4 NPT and connect to a ball valve air pump quick connector for controlled testing and service. Note: not suitable for diesel engines.

Ideal for gasoline-powered applications, it pairs with cars, trucks, boats, motorcycles, and ATVs, delivering a practical solution for valve-related tasks. The system provides direct access to spark plug holes and related ports, enabling careful pressurization without removing major components.

Key features

  • Thread adapters: M10, M12, M14, M18 to 1/4 NPT with a ball valve quick connector.
  • Inner interface: 1/4 NPT for versatile connections.
  • Hose I.D.: 3/8" (9.5 mm) for stable airflow during testing.
  • Working pressure: 30 PSI to 300 PSI (2 to 20 bar) to cover typical testing ranges.
  • Compact and portable design for on-site service.

How it helps during engine work

  • Facilitates valve spring or valve stem seal replacement by pressurizing the cylinder while keeping the valve closed.
  • Allows diagnostic checks by listening for leaks or sensing patterns of air leakage during compression.
  • Helps prevent the valve from falling into the combustion chamber during service with controlled pressure.

Durable construction and precise threading support repeated use, while the compact form keeps your workspace organized and accessible in tight engine bays.

Practical uses and scenarios

  • Widely applicable to gasoline engines in cars, trucks, boats, motorcycles, and ATVs.
  • Suitable for garages, workshops, or on-site service where LS engine maintenance is needed.

Tips for best results

  • Remove the spark plug and install the joint at the spark plug location when using M10+M12 or M14+M18 to NPT.
  • Follow standard safety practices and ensure the system is rated for the tested pressure range.

If you have questions, our support team can help with setup guidance and compatibility notes.

FAQ

Q: Is this kit compatible with LS engines?

A: Designed for gasoline LS engines; not suitable for diesel engines.

Q: How do I use the kit for valve work?

A: Remove the spark plug, attach the joint, pressurize the cylinder, and inspect for leaks.

Shipping & Return
Shipping & Return
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Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Shipping

We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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