Description

The SHARKBITE/CASH ACME UC4008LFA is a lead-free brass coupling designed to transition 1/2-inch polybutylene tubing to 1/2-inch PEX tubing. The fitting uses a barb-style connection on the polybutylene side and is secured with stainless steel cinch clamps, requiring a compatible cinch tool. Brass construction with a wetted surface containing less than 0.25 percent lead by weight keeps this fitting within California AB1953 and Vermont VT S152 low-lead restrictions. It is rated for continuous hot water circulation at up to 140 degrees F, making it appropriate for domestic hot water and recirculating systems. Package includes 6 fittings per unit.

This coupling is used in residential and light commercial plumbing applications where existing polybutylene supply lines require conversion to PEX tubing. It is particularly suited for remodel and repair scenarios where polybutylene runs are being transitioned without full repipe. The cinch clamp connection method provides a reliable, low-profile termination well suited to tight spaces common in retrofit work. Installation requires a stainless steel cinch clamp and cinch tool compatible with the TV 608-743 specification.

Key Features

Transitions 1/2-inch polybutylene barb to 1/2-inch PEX tubing in a single fitting
Lead-free brass construction wetted surface lead content under 0.25 percent by weight
Rated for hot water recirculation systems at up to 140 degrees F
Meets ASTM F-876 and ASTM F-877 to SDR-9 dimensional standards
NSF 14, NSF 61, and NSF CL-R certified for potable and chlorinated hot water systems
Complies with CSA B137.5, California AB1953, and Vermont VT S152 low-lead requirements

Compatibility

Designed for use with 1/2-inch polybutylene tubing transitioning to 1/2-inch PEX tubing. Requires stainless steel cinch clamps and a cinch tool meeting TV 608-743 specifications. Conforms to SDR-9 dimensional standards per ASTM F-876 and ASTM F-877.

Installation Notes

Installation is typically performed by a licensed plumber. Shut off the water supply and depressurize the line before cutting into any existing polybutylene or PEX tubing. A properly sized stainless steel cinch clamp and cinch tool rated for this connection type are required do not substitute conventional crimp rings without verifying compatibility. Verify that all connections meet local plumbing code requirements, including applicable sections of the IPC or applicable state amendments, before restoring water service.

Technical Specifications

Connection Size: 1/2 inch
Connection Type: Polybutylene Barb x PEX Barb
Material: Brass (Lead Free)
Maximum Temperature: 140 degrees F (continuous recirculation)
Lead Content (Wetted Surface): Less than 0.25 percent by weight
Clamp Type: Stainless Steel Cinch Clamp
Package Quantity: 6 per package
Weight: 0.63 pounds
Standards: ASTM F-876, ASTM F-877, SDR-9, NSF 14, NSF 61, NSF CL-R, CSA B137.5, AB1953, VT S152