24/7 Emergency Service
301B

The 301B single cartridge mechanical seal is a hydraulically balanced, rotary design seal engineered for durability and reliability. It features self-aligning faces and a carbon restriction bush, making it ideal for demanding pump and rotating equipment applications.
This mechanical seal includes Flush, Quench, and Drain options for environmental control, and depending on condition, all First4Seals cartridge seals can be fully refurbished to extend service life.
Type: Single Cartridge Mechanical Seal
Design: Hydraulically balanced, rotary design
Environmental Control: Flush, Quench, and Drain options
Self-Aligning Faces for precise operation
Refurbishable: Can be fully refurbished depending on condition
Materials: High-quality corrosion and wear-resistant materials
| POS | ITEM | MATERIALS |
|---|---|---|
| 1 | Sleeve O-Ring | Viton / EPR / Aflas / Kalrez |
| 2 | Sleeve | 316L SS |
| 3 | Rotary Face O-Ring | Viton / EPR / Aflas / Kalrez |
| 4 | Rotary Face | 316L SS – Carbon / SiC / TC |
| 5 | Spring | Alloy 276 |
| 6 | Stationary Face | Ceramic / SiC / TC |
| 7 | Stationary Face O-Ring | Viton / EPR / Aflas / Kalrez |
| 8 | Gland | 316L SS |
| 9 | Gasket | Novus 30 / PTFE |
| 10 | Alignment Ring | 316L SS |
| 11 | Restriction Bush | Carbon |
| 12 | Restriction Bush O-Ring | Viton / EPR / Aflas / Kalrez |
| 13 | Clamp Ring | 316L SS |
| 14 | Clamp Ring O-Ring | Nitrile / Viton |
| 15 | Drive Screw | Stainless Steel |
Pumps and rotating equipment
Chemical processing and food & beverage industry
Water treatment plants
Quarrying and industrial machinery
Anywhere environmental control with flush, quench, and drain is required
View additional images and details






Fill out the form and our team will get back to you within 24 hours.
FenflowKellett Gate, Spalding, Lincs, PE12 6EH