3/8 inch PEX Plastic Test Plug

43702 PEX Test Plug – 3/8 inch Plastic Fitting for Pressure Testing Applications

The 43702 PEX Test Plug is a 3/8 inch insert-style fitting designed for temporary closure of PEX tubing during system pressure testing. Made from reinforced polymer, this test plug is suitable for use in potable water and hydronic distribution systems where verifying pressure integrity prior to final commissioning is required.

Engineered for compatibility with ASTM F1807 crimp or F2159 cold expansion connections (depending on system specification), this plug provides a secure termination point that facilitates leak detection and system integrity verification during the rough-in phase.

Product Specifications

• ✅ Nominal Size: 3/8 inch
• ✅ Material: Engineered polymer (typically glass-filled PPSU or equivalent)
• ✅ Connection Method: Insert connection for crimp, clamp, or cold expansion (system-specific)
• ✅ Usage: Temporary termination of PEX tubing for pressure testing
• ✅ Pressure Rating: Suitable for use up to 160 PSI at 73°F, per applicable PEX system standards

Installation Considerations

Test plugs must be inserted into PEX tubing and secured using appropriate joining methods based on system design (e.g., copper crimp rings or stainless steel clamps for ASTM F1807; expansion ring for F1960). Always refer to the fitting manufacturer's installation guidelines and applicable ASTM standards to ensure proper sealing during pressure testing. Use of thread sealant is not required, as the plug is not threaded.

Typical Applications

This fitting is used in residential and light commercial plumbing systems to temporarily seal off ends of PEX tubing during hydrostatic or pneumatic pressure testing. It is commonly applied during rough-in phases to isolate branches or confirm integrity of closed-loop systems before final fixture installation or valve assembly.

Compliance and Standards

Test plugs used in PEX installations must conform to the same dimensional and material requirements as other fittings within the system. The 43702 plug meets applicable PEX system criteria under standards such as ASTM F877 and CSA B137.5. Always verify product suitability based on local code requirements and inspection standards.

Summary

• Fitting Type: PEX Test Plug
• Nominal Size: 3/8 inch
• Material: High-strength polymer (lead-free)
• Application: Pressure testing of PEX tubing installations
• Standards: Compatible with ASTM F1807, F2159, F877 systems