Engineered Marine Products 22-05309 Aluminum 3/8 in. NPT Pipe Plug

The Engineered Marine Products (EMP) 22-05309 is an aluminum pipe plug with a 3/8 in. NPT (National Pipe Taper) thread, designed for use in marine engine cooling systems, fuel systems, and fluid passages. This plug is used to cap or block off unused NPT-threaded ports on engine blocks, manifolds, risers, and other marine components where a secure, leak-free seal is required.

Machined from lightweight aluminum, this plug resists corrosion in the demanding saltwater and freshwater environments typical of marine applications. The tapered NPT thread design provides a self-sealing fit when installed with an appropriate thread sealant or PTFE tape.

Key Features:

• Thread size: 3/8 in. NPT (National Pipe Taper)
• Material: Aluminum — lightweight and corrosion-resistant
• Tapered NPT thread for a secure, leak-resistant fit
• Suitable for sealing ports on marine engine blocks, manifolds, cooling passages, and fluid systems
• Compatible with OEM and aftermarket marine engine applications
• Manufactured by EMP, a trusted marine parts supplier with over 40 years of industry experience

Use thread sealant or PTFE tape on plug threads prior to installation to ensure a positive, leak-free seal. This plug is an essential hardware item for marine engine rebuilds, maintenance, and repair projects.