1 inch x 1 inch x 3/4 inch PEX Polyalloy Reducing Insert Tee Crimp x Crimp x Crimp

1 inch x 1 inch x 3/4 inch PEX Polyalloy Reducing Insert Tee – ASTM F2159 Compliant

The 1 inch x 1 inch x 3/4 inch PEX polyalloy reducing insert tee is designed for use in potable water distribution systems and hydronic piping networks. This fitting enables a branch connection between two 1 inch PEX pipes and a 3/4 inch PEX outlet using ASTM F1807 or F2159 connection methods. The dimensional transition is ideal for multi-size system layouts and zoning applications.

Material and Compliance

This tee is manufactured from high-strength polyalloy (polysulfone or equivalent thermoplastic) and complies with NSF/ANSI 61 and 372 standards for lead-free potable water systems. It is approved for use in both hot and cold water applications and is resistant to chlorine and mineral scaling, making it suitable for long-term plumbing performance. Key attributes include:

• ✅ Polyalloy Construction – Offers high resistance to stress cracking, pitting, and chemical degradation in pressurized systems.
• ✅ Lead-Free Certification – Conforms to NSF/ANSI 61 and NSF 372 for use in domestic water systems.
• ✅ Temperature/Pressure Rating – Rated for continuous service up to 200°F and 160 psi, subject to local code and PEX pipe specifications.
• ✅ Standards: ASTM F2159 (cold expansion and crimp/clamp compatibility)

Technical Specifications

• Material: Polyalloy (typically PPSU)
• Nominal Sizes: 1 inch x 1 inch x 3/4 inch
• Connection Type: Insert/barbed ends for crimp ring or stainless steel cinch clamp systems
• Certification: NSF-pw, CSA B137.5, ASTM F2159 compliant

Installation Requirements

Designed for use with standard PEX installation tools. Pipe ends must be cut square and fully inserted into each barb. Use ASTM F1807-compatible copper crimp rings or ASTM F2098 stainless steel clamps with calibrated tools to ensure watertight seals. Connections should be pressure tested according to project and code requirements following installation.

Applications

Used primarily in residential and light commercial water distribution systems where transitions between branch sizes are required. Suitable for supply manifolds, fixture drops, and remote appliance connections in both new construction and remodel installations. Compatible with PEX-a, PEX-b, and PEX-c tubing when installed per manufacturer recommendations.

Code and Use Note

Polyalloy fittings are frequently selected for their dimensional stability under thermal expansion and high-chlorine environments. Their non-metallic construction also reduces galvanic corrosion risks in mixed-material systems.