Materials and Temperature Ratings:

• Standard Unit: Made from Class 30 gray iron, with a maximum temperature of 425F. Custom units are available in Carbon Steel and Stainless Steel upon special order.
• Quartz Clear: Designated by a "Q" in the model number. Maximum intermittent operating temperature is 2048F, and the maximum continuous operating temperature is 1600F (glass only).
• Pyrex Clear (Borosilicate Glass): Designated by a "P" in the model number. Maximum intermittent operating temperature is 554F, and the maximum continuous operating temperature is 446F (glass only). The glass is heat-strengthened for safety and coated with a heat-reflecting shield.

• Pipe Size: 4"
• Viewing Area: 3-3/8"
• A: 13-1/4" B: 5-5/8" C: 5-3/8" D: 9" E: 2-7/8"
• Size of Bolts: 5/8"
• Flange Bolt Circle: 8 on 7-1/2"
• PSI Rating: 5