Sharkbite/cash Acme UC4016LFA Pb to Pex Coupling 3/4 in

Product Description

The SHARKBITE/CASH ACME UC4016LFA is a lead-free brass transition coupling designed to connect 3/4-inch polybutylene (PB) tubing to 3/4-inch PEX tubing using stainless steel cinch clamps. The polybutylene end features a brass barb connection, while the PEX end accepts standard cinch-clamp installation with a compatible cinch tool. This coupling meets SDR-9 dimensional standards and is certified under ASTM F-876 and ASTM F-877. It is installed by licensed plumbers during PB-to-PEX system conversions or repairs in residential and light commercial potable water applications. Lead content on wetted surfaces is less than 0.25 percent by weight, satisfying low-lead regulations in potable water systems.

This coupling is used in residential and light commercial plumbing systems where existing polybutylene supply lines require transition to modern PEX tubing. It is suited for both hot and cold water lines and is NSF CL-R certified for use in hot water systems where chlorinated water up to 140 degrees F is continuously recirculated. Installation uses a stainless steel cinch clamp applied with cinch tool TV 608-743. It is appropriate for retrofit and repair work in systems originally plumbed with PB pipe, a common scenario in homes built between the late 1970s and mid-1990s.

Key Features

• Transitions 3/4-inch polybutylene tubing to 3/4-inch PEX tubing in a single fitting
• Lead-free brass construction — wetted surface lead content below 0.25 percent by weight
• NSF CL-R certified for hot water recirculation systems with chlorinated water up to 140 degrees F
• Meets ASTM F-876, ASTM F-877, and SDR-9 dimensional standards
• Certified to NSF 14, NSF 61, and CSA B137.5 for potable water use
• Complies with California AB1953 and Vermont VT S152 low-lead restrictions

Compatibility

Designed for use with 3/4-inch polybutylene tubing on the barb end and 3/4-inch PEX tubing on the cinch end. Requires stainless steel cinch clamps and cinch tool TV 608-743 for proper installation. Compatible with PEX tubing meeting SDR-9 dimensional standards per ASTM F-876 and ASTM F-877.

Installation Notes

Installation is performed by a licensed plumber. Shut off the water supply and depressurize the line before cutting into any existing tubing. The cinch clamp must be applied with the specified cinch tool to achieve a proper seal — do not substitute with other clamp styles. Verify local plumbing code compliance, particularly in jurisdictions with low-lead requirements, before installation in potable water systems.