D70 Heavy Duty 2-Piece Industrial Seal



  • Where the process fluid is corrosive or viscous and would clog instrument internals/solidify within the pressure gauge, switch or transmitter


  • Two piece construction and designed to withstand even the most severe process applications
  • “Continuous use” seals–backing plate will prevent diaphragm from rupturing if pressure sensing instrument fails. Pressure will be held until instrument is replaced
  • Diaphragm is separable for servicing and is available with a 1/8” NPT or 1/4” NPT flushing connection for removing any material which may clog the process connection
  • Standard diaphragm is constructed of AISI 316L stainless steel and welded to the upper chamber of the seal for pressures 30 psi (200 kPa) and above; optional FKM diaphragm available for ranges from 30” Hg Vacuum (-100 kPa) up to 100 psi (690 kPa). Others diaphragms available
  • FKM is highly recommended for applications less than 10 psi
  • ASME B40.100 compliant
  • RoHS compliant
  • CRN registered (all 316 SS only)
  • 5 year warranty


Housing 316L SS, Monel®, Hastelloy® C
Diaphragm 316L SS, Monel®, Hastelloy® C, FKM
Construction Two piece construction
Gasket Material Buna N (FKM, PTFE optional)

Bottom: 1/4”, 1/2”, 3/4” and 1” NPTF

Top: 1/4” and 1/2” NPTF

Process Temperature -22°F to 212°F (-30°C to 100°C)

Flushing connection available.

Other materials such as PTFE, PVC, Carbon steel, Alloy 20, Hastelloy® B, titanium, tantalum, etc. are available upon request

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#70 SEAL - VITON 1 / 4" TOP
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#70 SEAL 316 ST / ST 1 / 2" NPT TOP
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#70 SEAL 316 ST / ST 1 / 4" NPT TOP
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