NPT Port Blanking Plugs

Size

£3.30

In Stock

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2-Year Warranty

free repair or replacement

NPT Port Blanking Plugs – Tapered Thread Port Closures

Seal unused NPT threaded ports with our aluminium NPT Port Blanking Plugs. Designed for compatible female NPT connections, these plugs use a tapered male NPT thread and suitable PTFE tape or thread sealant to close redundant ports in oil, fuel, coolant and other fluid-system components.

Why Choose Our NPT Port Blanking Plugs?

Tapered NPT Connection

The male NPT thread progressively tightens into the mating female port. Use suitable PTFE tape or thread sealant to provide a reliable fluid seal.
Internal & External Hex Options

Choose between an external hex head or a low-profile internal hex design depending on installation space and tool access.
Compact Port Closure

Provides a straightforward solution for closing unused sensor, gauge or auxiliary fluid ports without requiring an additional adapter.
6061-T6 Aluminium Construction

Precision-machined from lightweight 6061-T6 aluminium and finished with black anodising for protection against wear and corrosion.

Internal Hex or External Hex?

Both styles use the same 1/8"-27 NPT male connection and sealing principle. The external hex version can be tightened using a suitable spanner or socket, while the internal hex version provides a lower-profile installed design and is tightened using a suitable hex key.

Type: NPT Port Blanking Plug For closing compatible unused female NPT ports
Available Styles: External Hex / Internal Hex Choose the drive style to suit installation space and tool access
Material: 6061-T6 Aluminium Lightweight, high-strength alloy
Finish: Black Anodised Protects against wear and corrosion

Connection 1: NPT Male Tapered thread · Use suitable PTFE tape or thread sealant

Available NPT port blanking plug options
Product Code	Connection 1	Drive Style
PLG-PRT-NPT-AL-18NPT-EH	1/8"-27 NPT Male Tapered thread	External Hex
PLG-PRT-NPT-AL-18NPT-IH	1/8"-27 NPT Male Tapered thread	Internal Hex

Sensor Ports
Gauge Ports
Oil Systems
Fuel Systems
Coolant Systems
Unused NPT Ports

Free repair or replacement for two years from the date of purchase. Learn more

Frequently Asked Questions

What are NPT port blanking plugs used for?
They are used to close unused female NPT threaded ports in compatible fluid-system components such as manifolds, sensor blocks, adapters, filter housings and cooler components.
What NPT connection do these plugs use?
Both versions use a 1/8"-27 NPT male tapered thread for installation into a compatible female NPT port.
How does an NPT port blanking plug seal?
NPT uses a tapered thread. The male plug tightens progressively into the female NPT port and should be installed using suitable PTFE tape or thread sealant.
Do I need thread sealant or PTFE tape?
Yes. Use suitable PTFE tape or thread sealant on the NPT connection. Keep excess sealing material clear of the first thread and fluid passage.
What is the difference between the external and internal hex versions?
Both versions use the same 1/8"-27 NPT connection. The external hex version is tightened using a suitable spanner or socket, while the internal hex version is installed with a suitable hex key and provides a lower-profile design.
Is NPT the same as BSPP?
No. NPT uses a tapered pipe thread, while BSPP uses a parallel thread and a different sealing arrangement. They should not be treated as interchangeable.
Do these NPT plugs use an O-ring?
No. These plugs use a tapered NPT connection rather than an O-ring sealed port connection.