Benefits: US made New and improved design includes a threaded brass chassis and improved gas delivery Performs best at 30 - 40 CFH Utilises same diffuser as original This high-quality Pyrex cup kit is perfect for welding and brazing applications. The cups are made of heat-resistant borosilicate glass, which can withstand temperatures up to 1, 475 degrees Fahrenheit. They are also resistant to chemicals and scratches, making them durable and long-lasting. What's In The Box BBW screw-on Pyrex cup Diffuser O-ring Please note. Do not overtighten the glass. Screw the cup on until you feel minimum tension. The brass will not bottom out on torch. DC only. Max 180A.