The Monument 438D Adaptor is a precision-engineered gas bottle adaptor designed to connect the Monument 430F Professional Torch to refillable gas bottles. This essential accessory enables tradespeople to use their torch with industry-standard refillable cylinders including Primus 2000 and Calor 340 bottles, offering a cost-effective and environmentally conscious alternative to disposable cartridges. Manufactured in Britain to exacting standards, this adaptor features a 7/16 inch UNEF thread connection ensuring secure, leak-free attachment between your torch and gas bottle. The robust construction provides reliable performance for professional plumbers, heating engineers and metalworkers who depend on consistent gas supply for brazing, soldering and general heating applications. Ideal for workshop environments and on-site work where refillable gas bottles are preferred, this adaptor delivers the convenience and economy of using larger capacity cylinders whilst maintaining the precision