3-1/2 inch Brass Countersunk Cleanout Plug

3-1/2 inch Brass Countersunk Cleanout Plug – Precision Fit for DWV System Access

The 3-1/2 inch Brass Countersunk Cleanout Plug is a threaded drain fitting used in drainage, waste, and vent (DWV) systems to provide secure, flush-sealing access for maintenance and system inspection. Manufactured from cast brass, this plug offers exceptional durability and corrosion resistance in both residential and commercial plumbing applications.

The countersunk head allows for recessed installation within the cleanout fitting or pipe hub, ensuring a smooth, tamper-resistant surface ideal for finish-grade applications such as floors or concrete slabs. Brass threading offers high strength and thermal stability for repeated installation and removal without thread degradation.

Key Functional Features

• ✅ Material: Cast Brass – offers high corrosion resistance in wastewater and non-potable environments.
• ✅ Thread Type: NPT (National Pipe Thread) – ensures secure sealing within cleanout tees or hubs.
• ✅ Countersunk Profile: Sits flush within pipe opening to minimize obstruction and surface interference.
• ✅ Reinforced Design: Suitable for use in high-traffic or concealed areas requiring periodic access.
• ✅ Temperature and Chemical Tolerance: Compatible with a broad range of drainage system conditions.

Typical Applications

This cleanout plug is used in DWV systems for capped access to horizontal or vertical waste lines. It is commonly found in basements, crawl spaces, utility rooms, or floor-level cleanout points. Its design enables hydrostatic testing or manual snaking/jetting during routine drain maintenance.

Technical Specifications

• Nominal Size: 3-1/2 inch
• Material: Solid Brass
• Connection: Male NPT Thread
• Head Type: Countersunk (Slotted)
• Compliance: Conforms to applicable plumbing codes for DWV systems

Installation Notes

Install using pipe joint compound or thread sealant as needed to ensure a gas- and water-tight seal. Tighten using a standard flat-head screwdriver or slotted cleanout wrench. Do not overtighten to avoid thread deformation in female hub fittings. Always verify compatibility with the receiving cleanout fitting thread type and nominal size.

Code Fact

Brass cleanout plugs are often required by local code when installed in accessible areas or locations subject to regular service, as they provide superior longevity and corrosion resistance compared to thermoplastic alternatives.

The 3-1/2 inch Brass Countersunk Cleanout Plug is a professional-grade solution engineered for access reliability and long-term DWV system integrity. Its robust construction and standard design ensure compatibility and code compliance for critical drainage access points.