Class 125 Caps

Class 125 caps are pipe fittings used to temporarily or permanently close off an open end on a PVC pipe. The fittings are designed to fit over the end of a pipe to create a tight seal and prevent the release of fluid or entry into an unfinished plumbing system by external contaminants. Class 125 cap fittings work by fitting snugly over the exterior end of a PVC pipe. The internal surface of the cap is engineered to match the outer diameter of the pipe to create a sealed connection when properly installed. They are commonly used in plumbing systems, irrigation systems, and industrial applications to terminate pipe lengths or to temporarily seal an open end for future use. Class 125 PVC cap fittings are a subclass of large diameter Schedule 40 fittings that have a lower maximum pressure rating of 125 PSI. Class 125 caps are made the same as standard Schedule 40 PVC but without final testing to save production costs and provide a cost effective alternative. Class 125 cap fittings offer a simple and reliable solution to terminate pipe runs, allow for future system expansion, or provide easy access points for maintenance. Overall, Class 125 caps 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 caps 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 caps are available in large diameter 10ʺ and 12ʺ sizes. They are made to Schedule 40 standard thickness and dimensions. Class 125 PVC caps feature a socket connection for slip on placement and solvent weld installation using PVC primer and cement. 

Class 125 cap fittings are made in the USA by Westlake Pipe & Fittings® (LASCO®), one of America’s top manufacturers of PVC pipework. They are produced using professional grade polyvinyl chloride (PVC) resin that meets ASTM D1784 standard requirements. The high quality PVC grade and class type create a large diameter fitting with improved mechanical durability, corrosion resistance, chemical compatibility, and long term service potential. The thermoplastic properties offer versatility for use with various applications, liquid types, and work conditions. Class 125 PVC caps are approved for temperatures up to 140°F and fluid pressures up to 125 PSI. The fittings are made in an NSF certified facility using premium materials free of harmful chemicals.

• 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″ in diameter
• Connection Options: Slip socket, push-to-fit

Class 125 caps are precision engineered to provide a secure closure for open ends of large diameter piping systems, effectively sealing off terminals to prevent flow or contamination, damage, or intrusion by foreign materials. Class 125 cap fittings features and benefits include resistance to corrosion and chemicals for long lasting performance, simple installation with solvent welding or push-to-fit connections, versatility for a wide range of plumbing applications, lower purchase cost compared to metal and traditional Schedule 40 alternatives, low thermal conductivity for temperature maintenance, and low weight for easy handling.

• 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 Closure: Creates a secure seal for open ended plumbing
• 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 caps are designed for large diameter plumbing systems with lower operational pressures, high fluid volumes, and applications where building and plumbing codes allow their use. They are used across residential, commercial, and industrial settings for their sufficient performance and low cost. Common uses for Class 125 caps include water distribution, drainage, irrigation, and waste handling systems. They see use in agriculture, large scale irrigation systems, chemical processing applications, and waste and water treatment for municipal facilities, industrial plants, and commercial buildings.

Save money, meet budgets, and complete large diameter, high volume plumbing applications with our Class 125 caps designed for reliable service in low pressure systems. Class 125 caps 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.