Starting at $400.05
  • Usually ships in 3-4 weeks



  • All-welded construction
  • Wide selection of materials
  • 1/4in NPT to 1in NPT process connection
  • 1/4in or 1/2in NPT female instrument connection
  • Pressure ranges:
    • 2 1/2in gauge:100 to 9000 psi
    • 4 and 4 1/2in gauge:400 to 9000 psi


The WIKA L990.34 Threaded Diaphragm Seals are suitable for corrosive, contaminated, hot or viscous pressure media. The upper and lower housing are welded with the Internal welded diaphragm, threaded process connection. It requires hydraulic fluid to transmit pressure to the instrument. Suitable pressure ranges from 100 to 9000 psi. Process connections are available from 1/4in to 1in NPT.