Hercules® Inverted Cone Stuffing Boxes feature unique inverted cone packing that is pressure-activated by well fluids for a superior seal without excessive tightening.

Regular Inverted Stuffing Box (IVSB™)

• Lowest profile design
• Ideal for smaller pumping units
• 1,500 PSI WP
• 350° F maximum operating temperature

Tee Base Inverted Stuffing Box (IVSBT™)

• Combines IVSB™ and cross tee with 1" bleeder
• Eliminates one threaded connection
• Lower profile than classic models
• Side outlets:
  2" LP with 2" bottom connection
  3" LP with 2-1/2" or 3" bottom connection
• 1,500 PSI WP
• 350° F maximum working temperature

Double Packed Stuffing Box (IVDPSB™)

• Exceptionally rugged, built for performance under tough conditions
• Primary packing can be changed under pressure by tightening compression bolts
• Lower profile than classic mode
• 1,500 PSI WP
• 350° F maximum working temperature