Class 125 Couplings

Class 125 couplings are used to connect two lengths of plain end PVC pipe. They are a subclass of Schedule 40 PVC fittings and a cost effective option intended for large diameter liquid systems with lower fluid pressure that do not require inspections or certified plumbing fittings. The Class 125 designation refers to their maximum working pressure of 125 PSI. Class 125 PVC couplings are designed to slip over the ends of two PVC pipes and are essential to complete the design and installation of a fluid plumbing system. They are to be secured using solvent weld installation to create a strong, leak proof connection between the pipes. Class 125 couplers differ from standard Schedule 40 in their approved maximum pressure rating and purchase cost. They are manufactured to Sch 40 dimensions but do not undergo the same pressure test before distribution. Overall, Class 125 couplings should provide the same performance as Schedule 40 fittings, although this cannot be guaranteed as post-production testing has not been performed.

**Notice** Class 125 couplings are not suitable for pressurized liquid applications to exceed 125 PSI or use in systems that require certified Schedule 40 PVC as per building or plumbing codes. They are not intended for use in pressurized air applications.

Class 125 coupling sizes include 10ʺ and 12ʺ in diameter. They are made to Schedule 40 standard thickness and dimensions. Class 125 reducer couplings are available in 6ʺ, 8ʺ, and 10ʺ sizes. The couplers come with plain end sockets for slip on connection and solvent weld installation with PVC primer and cement. 

Class 125 couplers are USA made by Westlake Pipe & Fittings® (LASCO®), a top trusted American pipework manufacturer. The couplings are made from heavy duty, high grade, ASTM D1784 PVC thermoplastic material. Class 125 couplings are rated for temperatures up to 140°F and pressures up to 125 PSI. Class 125 fittings are compatible with other Schedule 40 PVC components. The couplers are made in an NSF certified facility using high quality PVC material free of harmful chemicals or additives.

• 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: Sizes include 10″ and 12″ with 6ʺ, 8ʺ, and 10ʺ reducers available
• Connection Options: Slip socket

Class 125 couplings offer durability, versatility, and corrosion resistance for long term stability and use. Professionally engineered for use in various applications, Class 125 couplings offer exceptional benefits. Their PVC construction delivers high impact strength, low thermal conductivity, chemical compatibility, and reliable resistance to environmental and underground corrosion concerns. They are lightweight to ease handling and installation compared to metal and other pipe materials. Class 125 PVC couplings are designed for uninterrupted performance with smooth interior walls to prevent clogs and the potential buildup of biofilm or sediment. Corrosion and chemical resistance, simple installation, broad versatility, and ease of handling, Class 125 couplings are a reliable, cost effective choice for various plumbing systems and applications.

• PVC Material: Long lasting, stable plastic resistant to impact, chemicals, and corrosion
• Durable Construction: Resistant to environmental and underground corrosion
• Large Sizes: Large diameter fittings for high volume plumbing applications
• Pressure Rated: Can handle pressures up to 125 PSI
• Pipe Connections: Securely join two pipe lengths together
• Cost Effective: Economical compared to traditional Schedule 40 or metal pipe fittings
• Leakproof: Leak free connections when properly installed
• Easy to Install: Lightweight, socket connection for easy handling and installation

Class 125 couplings are engineered for large diameter plumbing systems operating under low to medium pressure conditions and handling high fluid volumes. The couplings can be used as a cost effective alternative in Schedule 40 PVC piping applications and where plumbing and building codes permit. Class 125 couplings are versatile and utilized in residential, commercial, agriculture, and industrial systems. They are commonly used to complete plumbing installations for systems that distribute potable or nonpotable water, manage wastewater and drainage, and transporting fluids used by onsite activities. Common uses for Class 125 PVC couplings include agricultural projects, large scale irrigation systems, chemical processing, and handling wastewater in industrial plants, manufacturing facilities, and commercial buildings.

Save money, meet budgets, and complete large diameter, high volume plumbing applications with our Class 125 couplings designed for reliable service in low pressure systems. Class 125 couplings 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, and industrial maintenance crews seeking professional grade products. Choose PVC Pipe Supplies for the best shipping rates, special contractor pricing, and deep discounts with our lowest price guarantee. Contact us for more information or details on contractor pricing, bulk orders, and availability.