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Polyethylene 3/8 NPT Tapered Protective Plug For Pipe Threads

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Description & Features

This polyethylene 3/8 NPT tapered protective plug safeguards pipe threads from damage and contamination. Designed for industrial applications, the plug provides a secure and reliable closure.

The protective closures, catalog number C1EJ55, are manufactured by Essentra Plastics. The plug conforms to the 3/8 NPT size specification, ensuring compatibility with corresponding fittings.

SKU: P-17

Supplier Part Number (MPN): P17A

Alternate Part Numbers: 17-P, C1EJ55, MI-05244731, MINO-02310X45122

Specifications

Brand
ESSENTRA COMPONENTS
Color
Blue
Inside Diameter
0.55 in
Material
LDPE
Size
5/8 in
Thread Sealant
Without Thread Sealant

Product Questions & Answers (4)

Question by: Wade G on Jul 19, 2025, 1:04 PM
Hey, will one of these plugs keep hydraulic fluid from leaking out during shipping?
Answer by: Customer Support on Jul 21, 2025, 12:43 PM
These plugs are designed to protect pipe threads with a tapered fit, but the product page doesn't explicitly state that they are designed to seal hydraulic fluid.
Question by: Frank M on Feb 10, 2026, 5:06 PM
got a 3/8 npt port i need to keep clean during storage, is this the right kind of plug for that
Answer by: Customer Support on Feb 12, 2026, 7:27 AM
For protecting pipe threads, this is a tapered polyethylene protective plug made for 3/8 NPT threads, so it’s a good match when you want to keep a 3/8 NPT threaded opening covered while it’s sitting or being handled.
Question by: Roger L on Jun 3, 2025, 4:27 PM
these just press in or do they thread into the fitting?
Answer by: Customer Support on Jun 5, 2025, 11:12 AM
Tapered NPT plugs thread in. The taper on the plug matches the taper of the pipe thread, so as you turn it in, it wedges snugly into the port. No press-fit here. Hand-tight is usually enough for a protective plug during storage or shipping, but a couple turns with a wrench will seat it more securely if you need it to stay put.
Question by: Hubert L on Jan 31, 2026, 7:29 PM
Reckon these plugs will keep the threads clean 'til I'm ready to use 'em?
Answer by: Customer Support on Feb 2, 2026, 8:04 AM
Absolutely, these polyethylene plugs are made to protect those threads from dirt and damage while they're in storage or transit.

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