PEX Copper Ring Crimping Tool Kit - Dual Jaw 1/2 and 3/4 in

Our review of the IWISS iCrimp PEX crimping tool kit finds it best suited to DIYers and plumbers who need a reliable, compact crimper for 1/2 in and 3/4 in PEX work. The single biggest reason to buy is the built-in dual jaw with a Go/No-Go gauge that arrives factory calibrated to the ASTM F-1807 standard, which saves time on setup and gives confidence that each copper ring crimp meets the expected size tolerance.

Key Features

• Built-in Dual Jaw: The integrated 1/2 in and 3/4 in polished jaw lets the user switch sizes without changing heads, keeping workflow fast and simple.
• Go/No-Go Gauge: The included gauge and instructions allow quick verification of crimps so you can confirm connections are within F-1807 tolerances.
• Factory Calibrated: Delivered calibrated to meet the ASTM F-1807 standard, reducing the need for immediate adjustments before first use.
• Broad Compatibility: Works with common copper crimp rings and brass or poly crimp fittings from major brands, so parts sourcing is straightforward.
• Smooth Actuation: The smooth mechanism requires minimal force for secure compressions, making repetitive crimping less fatiguing.
• Hardened Steel Construction: Durable materials and solid build quality stand up to regular jobsite use and give a sense of long-term reliability.

Who It's For

This tool is ideal for homeowners doing PEX plumbing projects and professional plumbers who want a compact, two-size solution without carrying multiple head adapters. The built-in gauge and factory calibration are particularly useful for users who value consistent, code-compliant crimps right away.

Those who need crimps for uncommon sizes or who prefer a tool with interchangeable jaws for many specialty fittings might look elsewhere; this kit focuses on the two most common residential sizes, 1/2 in and 3/4 in.

Pros & Cons

Pros

• Quality construction provides dependable performance and long service life.
• Comes with a Go/No-Go gauge and instructions so new users can verify and calibrate crimps.
• Works with widely used copper crimp rings and common PEX tubing brands, simplifying parts compatibility.
• Smooth action reduces hand strain during repetitive work.

Cons

• Limited to 1/2 in and 3/4 in crimp rings, so it does not cover less common PEX sizes without a different tool.

Specifications

Model	IWS-1234PS
Jaw Sizes	Built-in 1/2 in and 3/4 in
Standard	Factory calibrated to meet ASTM F-1807
Compatible Rings	Copper crimp rings (Sioux Chief, Watts, Nibco, etc.)
Compatible Tubing	All types of PEX and PE-RT tubing
Materials	Hardened steel construction
Included	Crimp tool, Go/No-Go gauge, instruction manual

Our Verdict

The IWISS iCrimp dual jaw PEX crimper is a practical, value-minded choice for most residential plumbing work thanks to its built-in 1/2 in and 3/4 in jaws, factory calibration, and verification gauge. It delivers reliable crimps with a smooth action and solid build, making it a good buy for homeowners and professionals who need a compact, ready-to-use crimper for the two most common PEX sizes.

Frequently Asked Questions

Does the tool need calibration before first use?
No, it arrives factory calibrated to meet ASTM F-1807, though the manual explains how to check and recalibrate if desired.

Which crimp rings will work with this tool?
It works with common copper crimp rings from major brands such as Sioux Chief, Watts, and Nibco as well as compatible brass and poly crimp fittings.

Can it crimp sizes other than 1/2 in and 3/4 in?
The tool is designed specifically for 1/2 in and 3/4 in copper crimp rings and does not support other sizes without a different crimper.