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200 Threaded Diaphragm Seal
The Ashcroft® 200 and 201 threaded diaphragm seals or isolation devices protect pressure measuring instruments.
Used when process compatibility is required, these are also applied when media exhibits high temperature or the potential to clog an instrument connection. Ideal for satisfying many challenging applications.
Ashcroft 200-201 Threaded Diaphragm Seals


Type 200: threaded; Type 201: threaded with flushing port
Process size
NPT female: 1/4" to 1 1/2", NPT male: 1/4" to 1"
Pressure Rating
Rated up to 2,500 psi, optional 5000psi


  • 316L stainless steel top housing (standard)
  • Wide selection of diaphragm and lower housing materials
  • Diaphragm welded (metallic) or bonded (elastomer) to top housing
  • Flushing port (type 201) provides easy cleaning / flushing due to process media prone to clogging
Trust the shield.


Ashcroft's passion is to design, manufacture, and deliver the most innovative and well-crafted pressure and temperature instruments so you can always trust the shield.

Get more information on the 200-201 Threaded Diaphragm Seal from Ashcroft.