Availability: In Stock
The W4 12V 21W single-contact bulb (Part No. 37510) features a 15mm bayonet (BA15s) base, ensuring a secure and vibration-resistant connection—ideal for vehicle and caravan lighting. Unlike screw bases, the bayonet design locks firmly in place, reducing the risk of loosening due to movement. Designed for consistent and reliable illumination, this bulb is perfect as a replacement or spare.
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