Siata Conversion Fitting kit Socket Union 2" external > 1 1/4" Internal (nylon) 2 required
Technical Resources
Technical Resources
Siata Conversion Fitting kit Socket Union 2" external > 1 1...
Simplify Your Upgrades: Siata 2" to 1 1/4" Conversion Fitting Kit
Modernize your water treatment setup with the Siata Conversion Fitting Kit. Specifically designed to bridge the gap between legacy systems and modern pipework, this kit allows for a seamless transition from 2" external socket unions to 1 1/4" internal connections.
Whether you are replacing an obsolete valve—like the Siata V132A-BFE/05—or reconfiguring your filtration vessel, this durable nylon kit provides a professional-grade solution without the need for extensive pipework modifications.
Key Features & Benefits
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Seamless Conversion: Easily adapts a 2" external socket union thread down to a 1 1/4" (32mm) internal connection.
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Corrosion-Proof Material: Crafted from high-quality reinforced Nylon, offering excellent chemical resistance and durability in wet environments.
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System Longevity: Ideal for maintaining or upgrading older Siata installations where original 2" parts are no longer available.
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Minimal Disruption: Engineered to allow existing pipework to remain in place, typically requiring only a minor adjustment (approx. 1 inch) to the vessel position.
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Full Installation Set: Sold as a required pair (2 fittings) to cover both the inlet and outlet ports of your control valve.
Product Specifications
| Attribute | Details |
| Material | High-Grade Nylon |
| External Connection | 2" Socket Union |
| Internal Connection | 1 1/4" (32mm) |
| Quantity Included | 1 Fitting (2 required for complete Kit) |
| Primary Compatibility | Siata V132, V230, V250 Series |
| Common Use | Replacing Obsolete V132A-BFE/05 Valves |
Installation Note
This kit is the industry-standard solution for technicians looking to adapt larger valve ports to standard 1 1/4" plumbing. Because these fittings add a small amount of length to the valve assembly, ensure you have approximately 25mm (1 inch) of clearance to move your pressure vessel during installation.
Important: Always use a high-quality thread sealant or silicone grease on the union faces to ensure a pressure-tight seal without over-torquing the nylon
Replacing an obsolete Siata V132 valve with a modern equivalent using the 2" to 1 1/4" Conversion Fitting Kit is a common task for water treatment professionals. Because the new assembly is slightly longer than the original, following these steps ensures a leak-free installation without stressing your pipework.
Technical Guide: Replacing a Siata V132 Valve
Pre-Installation Checklist
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Space Requirements: Ensure you have approximately 25mm (1 inch) of lateral movement in your pipework or the ability to slide your pressure vessel slightly to accommodate the added length of the conversion fittings.
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Tools Needed: Strap wrench (to avoid scarring nylon), silicone grease (NSF 61), and a pipe cutter (if adjustments are needed).
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Parts: 1x New Control Valve, 2x Conversion Fittings (2" External > 1 1/4" Internal), and new O-rings.
Step-by-Step Installation
1. System Isolation & Depressurization
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Turn off the water supply to the unit.
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Initiate a manual regeneration cycle to relieve internal pressure, then unplug the power supply.
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Disconnect the existing union nuts from the old V132 valve.
2. Prepare the Conversion Fittings
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Inspect the Nylon Conversion Fittings for any molding flash or debris.
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Apply a thin, even coat of Molykote 111 or similar silicone grease to the internal and external threads/O-ring seats.
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Note: Do not use PTFE tape on these nylon unions unless specifically directed, as the O-ring provides the primary seal.
3. Fitting the Adapters to the New Valve
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Thread the 2" external side of the conversion fittings into the inlet and outlet ports of your new valve.
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Tighten them hand-tight plus a 1/4 turn using a strap wrench. Over-tightening nylon can lead to stress fractures over time.
4. Aligning the Vessel
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Since the new configuration is slightly longer, you will likely need to shift your pressure vessel (the tank) roughly 1 inch away from the main plumbing headers.
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If your pipework is rigid (Copper or PVC), you may need to trim a small section of the pipe to maintain proper alignment and prevent "side-loading" the valve ports.
5. Connecting the 1 1/4" Unions
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Align the existing 1 1/4" pipe unions with the internal threads of the conversion kit.
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Ensure the seating O-rings are centered.
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Tighten the union nuts securely.
6. Testing & Startup
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Slowly open the inlet bypass valve to 25% to allow the system to pressurize gradually.
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Check for leaks around the conversion fitting threads.
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Once pressurized, fully open the inlet and outlet valves and run a test cycle to ensure the flow rate is consistent.
Maintenance Tip
Re-check the tightness of the nylon unions after 24–48 hours of operation. Thermal expansion from water temperature fluctuations can occasionally cause the nylon to "settle," requiring a slight manual snugging.
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