
IWISS IWS-S & SL Series: The Ideal Partner for Viega PureFlow Press Fittings
Choosing the right pressing tool ensures secure and leak-free connections in PureFlow PEX systems. IWISS offers two key series—SL Series and IWS-S Series—designed for stainless steel PEX sleeves and Viega PureFlow fitting. This article explores their applications, compares them with the Viega PureFlow Crimp Hand Tool and Milwaukee 2674-22P M18 Short Throw Press Tool Kit, and highlights advantages.
IWISS SL Series: Compact Angled Pressing Tools
The SL Series includes SL-12 (1/2''), SL-34 (3/4''), and SL-1 (1''), designed for working in confined spaces while maintaining high-quality PureFlow PEX pressing.

Key Features
- Angled head design for better access in tight spaces.
- Folding handles (SL-12 & SL-34 models) are used for more effortless operation with 50% labor saved, compact storage, and easy transportation.
- Lightweight and compact, reducing hand fatigue.
- Adjustable pressing force for optimized performance.
- Polished jaws ensure smooth, damage-free pressing.
- Meets ASTM F877 standards for consistent and secure PEX connections.
Best For
Plumbers working in tight spaces, where angled-head pressing tools provide a significant operational advantage.

IWISS IWS-S Series: Heavy-Duty Straight Pressing Tools
The IWS-S Series includes IWS-S12 (1/2''), IWS-S34 (3/4''), IWS-S1 (1''), and IWS-S1234 (1/2'' & 3/4''). These tools are designed for high-pressure pressing in large-scale PureFlow PEX installations.

Key Features
- Works with stainless steel PEX sleeves to ensure secure connections.
- The straight-handle design provides substantial leverage for effortless pressing.
- Go/No-Go gauge included for quality verification.
- The folding handle (IWS-S1 model) is used for more effortless operation with reduced effort, compact storage, and easy transportation.
- Meets ASTM F877 standards for high reliability.
Best For
Professional plumbers and contractors working on large-scale PureFlow PEX installations, where durability and precise pressing are essential.
Comparison: IWISS vs. Viega vs. Milwaukee
IWISS tools offer straight-handle (IWS-S Series) and compact angled-head (SL Series) pressing solutions for PureFlow applications. Below is a comparison with Viega and Milwaukee tools.
Feature | IWISS SL Series | IWISS IWS-S Series | Viega PureFlow Tool | Milwaukee 2674-22P |
---|---|---|---|---|
Material | High-carbon steel | High-carbon steel | Steel | High-strength metal |
Handle Type | Ergonomic | Ergonomic | Ergonomic | Pistol grip |
Head Type | Angled | Straight | Angled | Straight |
Compact Design | Yes | No | Yes | Yes |
Power Source | Manual | Manual | Manual | Battery-powered |
Adjustable Crimp Force | Yes | No | No | Auto-cycle |
Best For | Tight spaces | Heavy-duty jobs | Viega fittings | High-speed pressing |
Price | $65.99-85.99 | $42.99+ | $130+ | $800+ |

Why Choose IWISS for PureFlow PEX?
- SL Series: Best for tight-space applications, offering easy maneuverability.
- IWS-S Series: Ideal for large-scale installations requiring substantial leverage and high durability.
- Viega PureFlow Tool: This is for installers working exclusively with Viega fittings.
- Milwaukee 2674-22P: A high-speed, cordless solution for contractors needing quick and efficient pressing.
IWISS provides cost-effective, high-quality pressing tools for PureFlow PEX, ensuring strong, leak-free connections. Professionals can enhance workflow efficiency and installation precision by selecting the right tool.