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Class 125 Fittings

Class 125 fittings are a subclass of schedule 40 large diameter PVC fittings. They are a more cost effective option suited for handling fluid systems with lower overall pressure. Class 125 PVC fittings differ from standard schedule 40 in their approved maximum pressure rating and associated purchase cost. They are manufactured to schedule 40 dimensions but do not undergo the same pressure test prior to distribution. Therefore Class 125 fittings are not certified to the same max working pressure. This is the single manufacturing difference between schedule 40 and Class 125 PVC fittings and contributes to their lower purchase price. Class 125 fittings are pressure rated up to 125 PSI, and for temperature handling, are heat rated up to 140 degrees F (60°C). Class 125 fittings come in socket by socket connections suitable for one piece mold glue fitting with primer and cement. They are offered in 10” and 12” diameter sizes. The lower pressure rating of Class 125 fittings makes them perfect for large size plumbing applications that will experience less pressure in the piping system. For acceptable work applications, use of Class 125 PVC can help recognize significant cost savings as they are cheaper than traditional schedule 40 fittings. Class 125 fittings are stocked and available in tees, elbows, couplings, reducer bushings and caps. Purchase discounts are available for Class 125 couplings, bushings and caps when ordered in bulk quantities.

Class 125 fittings are a specialized subclass of Schedule 40 large diameter PVC fittings. They are engineered for high volume fluid systems that work at lower overall fluid pressures. Named for their maximum recommended working pressure of 125 PSI, Class 125 fittings are a cost effective alternative to conventional Schedule 40 fittings due to their unique manufacturing process without post-production pressure testing protocols. This intentional deviation creates a niche for applications with less strict pressure conditions while maintaining accuracy and reliability. 

Compared to traditional Schedule 40 fittings, Class 125 PVC fittings have a lower maximum pressure rating and are a budget friendly option when large fittings are needed and specific inspections or certifications are not required. Class 125 fittings are suitable for both above ground and underground installation. Their PVC construction offers reliable resistance to environmental corrosion and underground soil chemistry. Overall, Class 125 fittings should provide the same performance as Schedule 40 fittings, although this cannot be guaranteed. 

**Notice** Class 125 fittings are not suitable for pressurized liquid applications exceeding 125 PSI or systems requiring certified Schedule 40 PVC as per building or plumbing codes. They are not intended for use in pressurized air applications.

Class 125 Fitting Sizes and Options

Class 125 fitting sizes include 10ʺ and 12ʺ in diameter made to Schedule 40 thickness standard. Several Class 125 reducer fittings are also available to join pipes or components of different sizes. Class 125 PVC fittings come with plain end slip socket connections for one piece solvent weld installation using primer and cement. Socket to socket connections ensure straightforward and reliable assembly. 

Class 125 fittings are available in various configurations including elbows, tees, couplings, caps, and bushing adapters to accommodate different system setups and requirements. The fittings are used to create directional changes, branching, joints, closures, or size transitions within the system. 

Technical Specifications

Class 125 PVC fittings are USA made by Westlake Pipe & Fittings®, previously LASCO Fittings®, one of America’s top trusted manufacturers of PVC pipework. Class 125 fittings are made from polyvinyl chloride (PVC), a thermoplastic material known for its durability, versatility, corrosion resistance, and long term stability. The fittings are manufactured using high quality materials and production methods in an NSF certified facility. Class 125 fittings are rated to withstand pressures up to 125 PSI, heat rated for temperatures up to 140°F (60°C), and compatible with Schedule 40 PVC pipe. The PVC material used in Class 125 fittings is known for its safety and does not contain harmful chemicals like lead or cadmium.

  • Material Profile: ASTM D-1784 Type I Grade I PVC Cell Class 12454 
  • Color: White
  • Performance Standards: Non-tested / certified
  • Pressure: Up to 125 PSI
  • Temperature: Up to 140°F (60°C)
  • Sizing Standard: Schedule 40 thickness standard
  • Size Options: Available in diameters ranging from 10ʺ to 12ʺ in diameter
  • Connection Options: Slip socket

Features and Benefits

Class 125 fittings are professionally made and engineered to offer numerous benefits for various applications where Schedule 40 PVC pipe and fittings can be used. Their PVC construction provides high impact strength, low thermal conductivity, and corrosion resistance that makes them a reliable choice for long term use in plumbing systems. They are lightweight for easier handling and installation compared to metal or other heavy materials. Class 125 fittings have smooth interior walls to prevent the buildup of biofilm or sediments, clogging, and ensure efficient flow within the system.

  • PVC Material: Highly durable, stable, long lasting plastic resistant to impact, chemicals, and corrosion
  • Durable Construction: Made from PVC, providing resistance to environmental corrosion and underground soil chemistry
  • Large Sizes: Available in 10ʺ and 12ʺ diameters to meet the needs of high volume plumbing applications
  • Pressure Rated: While not certified as standard fittings, Class 125 fittings are pressure rated for up to 125 PSI
  • Versatile Options: Range of tees, elbows, couplings, caps, and bushings to match plumbing layouts and installation
  • Cost Effective: More economical pricing compared to traditional Schedule 40 fittings
  • Leakproof: Engineered for leak free connections when properly installed
  • Easy to Install: Socket by socket connections and lightweight design for easy handling and straightforward installation 

Applications and Uses

Class 125 fittings are ideal for large diameter plumbing systems where the operational pressure is lower, making them suitable for high volume flow applications that do not require high internal liquid pressures. Their cost effectiveness and adequate performance make them a practical choice for scenarios where plumbing standards and building codes allow their use. Class 125 fittings have a wide range of applications in residential, commercial, and industrial settings. They are commonly used in plumbing systems for potable water distribution, drainage, irrigation, and sewage transport. Common applications and uses for Class 125 PVC fittings include agriculture, large scale irrigation systems, chemical processing applications, and waste and water treatment for municipal facilities, industrial plants, and commercial buildings.

Precision and Performance

Save money, meet budgets, and complete large diameter, high volume plumbing applications with our Class 125 PVC fittings designed for reliable service in low pressure systems. Class 125 PVC fittings offer a practical solution for specific plumbing applications where lower pressure ratings are acceptable and provide significant cost benefits while maintaining essential performance characteristics for engineers, contractors, construction professionals, and industrial maintenance crews seeking professional grade products. 

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