Cast Iron Radiator Reducer 1 1/4″ → 1/2″ BSP
$11.79 on Amazon.com (as of October 17, 2026, 8:15 AM EST) View details ↗
Upgrade your plumbing or radiator system with this **right-hand thread cast iron reducing bush**, designed to seamlessly connect **1 1/4″ (40mm) to 1/2″ (20mm) BSP fittings**. Crafted from **durable cast iron**, this reducer delivers **high-pressure resistance** and long-term reliability, making it ideal for both residential and commercial applications. Whether you're working with radiators, piping systems, or industrial setups, this **BSP-threaded adapter** ensures a secure, leak-proof connection while simplifying size transitions.
The **right-hand thread** ensures compatibility with standard BSP fittings, while its **heavy-duty construction** resists corrosion and wear, even in demanding environments. Fits **1.5″ (40mm) holes** with an inner diameter of **3/4″ (20mm)**, providing a precise, snug fit for professional-grade installations. Trust LT Easiyl for a **versatile, high-performance solution** that meets the needs of plumbing and HVAC systems alike.
| Thread Type | Right-Hand BSP (BSP Parallel) |
|---|---|
| Size Reduction | 1 1/4″ (40mm) → 1/2″ (20mm) BSP |
| Material | Cast Iron |
| Outer Hole Fit | ~1 1/2″ (40mm) |
| Inner Diameter | 3/4″ (20mm) |
| Application | Radiators, piping, industrial/commercial systems |






