Unlike other types of connections that require tool calibration or go/no-go gauges, expansion is a completely visual connection. If you can see the expansion ring touching the shoulder of the fitting, it is connected properly. The properties of PEX work with this connection. Due to the shape memory of PEX, the weakest that this connection will ever be is when it is first joined. As the PEX contracts, it will increase the strength of the connection. The fittings have virtually the same inside diameter as the pipe, creating less restriction and often allowing for smaller pipe sizes. It also makes the connection impossible to dry-fit. The tools are close to one size fits all, with the exception of the expansion heads, which need to be changed out for different pipe sizes.

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Expansion Head for ProPex Connection with Auto Rotate Mechanism
  Meet ASTM F1960 Auto-rotate design inse the expansion head Chrome plated for weather and corrosion resistance Compatible...
  1/2,3/4,5/8,1" PEX Pipe expansion head: meet ASTM F1960  The ProPEX Expansion Heads are precision engineered for accurate...
IWISS PEX Pipes Tube Expander With 16/20/25/32mm Expansion Head Suits Uponor For Water And Radiator Connection The IWISS...
  IWS-F1960 Item includes: 1* Expanding Tool3* Expansion Heads(1/2", 3/4", 1")1* Grease 1* Plastic Case Item Weight 5.85 pounds Package...
Model No.: IWS-F1960R Features: Fully compatible with F1960 standard PEX expansion system from Uponor ProPEX, Wirsbo. Three expansion heads are precision engineered and processed with Wire EDM Cutting for accurate expansion. They are made from high-strength steel, the chrome-plated segments and black oxide ring combine durability and weather resistance. The expansion heads will rotate automatically every circle of the handles fully open and closed, which can ensure no deep grooves on the interior of the pipe which can lead to leak paths. The manual expander is constructed from aluminum alloy, lightweight for easy operation in narrow space or height. The cone is made from spring steel with chrome-plated for weather and corrosion resistance. Ergonomic curved handles are cushioned with non-slip grips, reduce hand fatigue.
Model No.: IWS-F2 Features: Conforms to the ASTM F1960 standard specification. Constructed of PEX with good “shape memory,...
Model No.: IWS-F3 Features: Conforms to the ASTM F1960 standard specification. Constructed of PEX with good “shape memory,...
Model No.: IWS-F4 Features: Conforms to the ASTM F1960 standard specification. Constructed of PEX with good “shape memory,...
Model No. : IWS-1960D KIT Compatible with F1960 standard PEX expansion system from Uponor ProPEX, Wirsbo and so on. All-in-One toolset comes with a manual expander, 1/2,3/4, 3/8, 1-inch head, expansion ring removal tool, pipe cutter, and lubricant. The expansion heads are precision engineered and processed with Wire EDM Cutting for accurate expansion. All heads feature with the auto-rotation interface, they can rotate automatically during expansions, and the PEX and rings will be expanded evenly....
Design to remove expansion rings and PEX-A pipes from F1960 brass fittings, no heating gun required. No adjustment required, simply cut off the expansion rings and PEX-A pipes. Scientific built-in cutting blade and reasonable gap prevent damage to the brass fittings. Constructed of high-quality steel with high wear and corrosion resistance. Two extra spare blades included. Work with 1/2,5/8,3/4 & 1-inch expansion rings outside the brass fittings, DO NOT work with PPSU fittings.
Model No. : IWS-1960D Compatible with F1960 standard PEX expansion system from Uponor ProPEX, Wirsbo and so on. All-in-One toolset comes with a manual expander, 1/2&3/4 inch combo head,  pipe cutter, and lubricant. The expansion heads are precision engineered and processed with Wire EDM Cutting for accurate expansion. All heads feature with auto-rotation interface, they can rotate automatically during expansions, and the PEX and rings will be expanded evenly. The PEX radial cutter makes its cuts with a quick rotation, provides correct cutting pressure for a square cut, and eliminates the...
  Meet ASTM F1960 Standard Precision engineered Expansion head for accurate expansion of Uponor PEX-A tubing for ProPEX...
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