WHK 6 Pack Propress Fittings 1 in Press x 1 in PEX Adapter - Fast

Our review of the WHK 6 Pack Propress Fittings finds them best for plumbers, remodelers, and DIYers who need a reliable copper to PEX B connection that installs quickly. The bottom line: these 1 in press x 1 in PEX crimp couplings deliver solid, lead-free brass construction and simple crimp installation for potable water, HVAC, and RV systems, making them a practical choice when a watertight, corrosion-resistant adapter is needed without soldering or adhesives.

Key Features

• Package Quantity: Six fittings per pack provide spare parts for small jobs or a single larger repair session.
• Lead-Free Brass: The fittings are made from premium lead-free brass to meet potable water standards and reduce contamination risk.
• Press to PEX Compatibility: Designed for 1 in copper press connections and 1 in PEX B or PEX C tubing to simplify transitions on mixed-material runs.
• Quick Installation: No solder, glue, or flux is required; the crimp method and press feature let installations be completed in seconds.
• Temperature and Corrosion Resistance: Rated for cold and hot water use and tolerant of typical plumbing temperatures up to the rated range.

Who It's For

This fitting is aimed at professional plumbers and confident DIY homeowners performing potable water, HVAC, or RV plumbing work who need a reliable adapter between copper press pipe and PEX B or PEX C tubing. The pack of six is useful for service calls, small remodels, or stocking a truck box.

Those using PEX A or expander-type systems should look elsewhere since these adapters are not compatible with expander fittings or PEX A tubing. If you require specialty sizes, nonstandard materials, or integrated shutoffs, a different fitting type will be necessary.

Pros & Cons

Pros

• Solid lead-free brass construction gives confidence for potable water use and long-term corrosion resistance.
• Six-piece pack offers value and readiness for several connections or repairs.
• Installation is fast and clean without solder, glue, or flux, saving time on the job.
• Compatible with common North American PEX B and PEX C tubing standards.

Cons

• Not compatible with PEX A expander fittings, limiting use for some PEX systems.
• Only available in 1 in size, so projects requiring different diameters need other parts.

Specifications

Brand	WHK
Type	Press x PEX Adapter
Size	1 in press x 1 in PEX
Material	Lead-free brass
Pack Quantity	6 pieces
Compatibility	PEX B and PEX C tubing (not for PEX A/expander)
Standards	Compliant with ASTM F2159, CSA B137.5, NSF/ANSI 61, 14, 372

Our Verdict

The WHK 6 Pack Propress 1 in press x 1 in PEX adapters are a practical, cost-effective choice for connecting copper press lines to PEX B or C tubing. They combine lead-free brass durability, rapid crimp installation, and enough quantity for jobsite needs, making them a good value for plumbers and experienced DIYers who do not use PEX A expander systems.

Frequently Asked Questions

Are these fittings safe for drinking water?
Yes. They are made from lead-free brass and comply with relevant potable water standards for safe use.

Can I use these with PEX A tubing?
No. The fittings are not compatible with PEX A or expander-type systems and should only be used with PEX B or PEX C.

Do these require soldering or glue?
No. The adapters install with a crimp and press method without solder, glue, or flux, which speeds installation.