Schedule 80 PVC Plugs

Schedule 80 PVC plugs are essential end fittings used to cap off pipe openings in pressurized liquid systems, providing a secure, watertight seal. Whether you're sealing a temporary system, performing pressure testing, or terminating a line long-term, these plugs offer the strength and reliability required for demanding applications.

Made from thick-walled Schedule 80 PVC, these plugs offer superior durability and chemical resistance compared to standard Schedule 40 options. Their increased pressure rating — often up to 400 PSI at 73°F — makes them ideal for industrial, commercial, and high-performance plumbing systems. Choose from male pipe thread (MPT) or spigot styles to suit the connection type of your system, including both threaded and socket-based configurations.

At Maxx Supply, we provide a wide range of Schedule 80 PVC plugs in sizes from 1/4" to 4", with select models NSF-certified and compliant with ASTM D2467, ASTM D1784, and ASTM D2534 standards. Our extensive inventory, expert support, and commitment to quality make us the trusted supplier for professionals and DIYers alike.

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Suitability & Applications

Where are Schedule 80 PVC plugs commonly used?

These durable plugs are built for high-performance applications across a wide range of industries. They’re suitable for use in:

  • Chemical processing systems
  • Agricultural irrigation lines
  • Industrial fluid distribution
  • Potable water and wastewater treatment systems
  • Compressed air pipelines (where allowed per safety guidelines)

Schedule 80 plugs are particularly effective in maintenance and shutdown scenarios — used to cap off unused pipe ends or seal systems during temporary disconnection. Their resistance to corrosion and chemicals makes them ideal for both indoor and outdoor use, including exposure to harsh environments and pressurized conditions.

Most Schedule 80 PVC plugs are rated up to 400 PSI at 73°F and are available with NSF standard certification for use in potable water systems.

Sizing Guidance & Compatibility

How do I select the correct plug size and thread type?

To ensure a tight seal, always match the plug to the nominal pipe size and correct connection type:

  • MPT plugs fit female-threaded openings.
  • Spigot plugs fit into socket-style fittings and should be solvent-welded.

While Schedule 80 plugs are primarily intended for Schedule 80 pipe systems, they can be used with Schedule 40 pipe in certain applications, provided the pressure rating and tolerances align. Always check fitting depth, diameter compatibility, and any system pressure limits when mixing components across schedules.

If you're unsure which PVC Schedule 80 fittings are compatible, Maxx Supply’s team can help verify the correct plug for your application.

Schedule 80 PVC Plug Installation Tips

How are threaded and spigot plugs installed correctly?

Proper installation is key to long-term performance and system integrity:

  • Threaded (MPT) plugs:
    • Apply thread sealant tape or compound to the male threads.
    • Avoid over-tightening to prevent stress cracking.
  • Spigot plugs:
    • Use an NSF-approved PVC primer followed by solvent cement.
    • Allow proper curing time before pressurizing the system.

Best practices for plug installation also include:

  • Always depressurize the system before installing or removing plugs.
  • For long-term closures, inspect periodically for signs of wear, loosening, or leaks.
  • Use tools specifically designed for plastic pipe fittings to avoid over-compression or cross-threading.

Need help choosing the right sealant or tool? Ask our experts — we carry trusted brands like Oatey industrial grade products for professional-grade results.

Why Order Schedule 80 PVC Plugs Through Maxx Supply?

With a vast selection of Schedule 80 PVC plugs, expert support, and fast nationwide shipping, Maxx Supply is your go-to source for PVC fittings that meet the highest industry standards:

  • Wide product range in threaded and spigot styles
  • NSF-certified options for potable water use
  • ASTM D2467 and ASTM D1784 compliance for quality and performance
  • Trusted by contractors, engineers, maintenance teams, and DIY enthusiasts

Browse our full line of Schedule 80 PVC fittings here and cap off your plumbing system with confidence.