Marshall Excelsior | Flare Fitting Cap / Plug | 704039-08 | 3/8 Inch Flare | Hex Plug | Brass | Single

Marshall Excelsior 704039-08 Flare Fitting Cap / Plug

The Marshall Excelsior 704039-08 Flare Fitting Cap / Plug is a reliable solution for safely sealing unused or disconnected propane (LP) gas lines in RV, marine, and residential applications. Designed for durability and leak-free performance, this cap/plug is ideal when capping off an LP line after removing or replacing gas-powered appliances such as RV refrigerators, furnaces, or water heaters.

Manufactured from high-quality brass, the fitting offers excellent corrosion resistance and long service life. Its precision-machined flare design ensures a secure metal-to-metal seal when properly installed—no pipe thread sealant is required on flare connections. Whether used for temporary service work or permanent installation, this fitting helps maintain system safety and compliance.

Key Features:

• Genuine Marshall Excelsior quality

• Brass construction for strength and corrosion resistance

• Designed to cap or plug unused LP gas flare fittings

• Provides a secure, leak-resistant metal-to-metal seal

• Ideal for RV, propane, and gas appliance applications

Common Uses:

• Capping off propane lines after appliance removal

• Sealing unused flare fittings in RV or LP gas systems

• Service and maintenance of propane distribution lines

The Marshall Excelsior 704039-08 Flare Fitting Cap / Plug is a simple but essential component for maintaining a safe, properly sealed propane system.