2" & 3/4" Drum Bung Caps – Fine & Coarse Thread

Drum bung caps are used to seal standard drum openings and protect contents from leaks, contamination, and pressure issues. These caps are designed for 55 gallon drums with 2-inch and 3/4-inch bung openings, which are the most common configurations used in the U.S.

This category includes 2" poly bung caps with fine thread (NPT) and coarse buttress thread options, as well as caps with 3/4" center taps for attaching pumps, faucets, or vent plugs. Also available are 3/4" bung plugs and adapters for converting thread types. Most industrial drums use a combination of fine and coarse threads, so choosing the correct cap is critical for proper sealing and compatibility.

Plastic bung caps are lightweight, corrosion-resistant, and suitable for chemicals, water, and general industrial use. These caps are widely used in chemical storage, food-grade applications, water treatment, and fluid transfer systems.

If you need reliable sealing for drum openings, these bung caps and plugs provide a cost-effective and easy-to-install solution.

FINE THREAD VS COARSE THREAD: Drum bung caps are available in fine thread (NPT) and coarse buttress thread designs. Fine thread caps provide a tighter seal and are commonly used for liquids requiring leak prevention. Coarse thread caps are easier to install and remove, making them useful for frequent access. Most 55 gallon drums use one of each type, so it is important to match the correct thread.

2-INCH AND 3/4-INCH BUNG SIZES: Standard drums typically have two openings: a 2-inch bung and a 3/4-inch bung. The 2-inch opening is used for filling and dispensing, while the 3/4-inch opening is often used for venting or accessory attachments. These caps and plugs are designed to fit these standard sizes.

BUNG CAPS WITH CENTER TAPS: Some 2-inch bung caps include a 3/4-inch center tap. This allows users to attach drum pumps, faucets, or other accessories without removing the main cap. This feature improves efficiency and reduces the need for additional fittings.

MATERIAL AND CHEMICAL RESISTANCE: Polyethylene bung caps are resistant to many chemicals, making them suitable for industrial and water-based applications. They are lightweight, durable, and do not rust or corrode, making them a practical choice for long-term use.

BUNG PLUGS AND ADAPTERS: In addition to caps, 3/4-inch bung plugs are available for sealing smaller openings. Adapters allow conversion between different thread types, such as fine NPT to coarse thread connections. These accessories improve compatibility across different drum systems.

INDUSTRY APPLICATIONS: Bung caps and plugs are used in chemical storage, food processing, water treatment, oil handling, and manufacturing. They are essential for maintaining sealed containers and safe fluid handling.

BUYING CONSIDERATIONS: When selecting bung caps, confirm thread type (fine or coarse), size (2-inch or 3/4-inch), and whether a center tap is needed. Using the correct cap ensures a proper seal and prevents leaks.

COST AND VALUE: Bung caps are a low-cost but critical component for drum systems. Bulk pricing options make them cost-effective for facilities handling large volumes of drums.

2" and 3/4" bung caps seal drum openings. Fine thread = tighter seal. Coarse thread = easier use. Some include 3/4" tap for pumps. Cheap but critical for leak prevention and compatibility.