Starting at $238.42

Not in stock. Usually ships in 3-4 weeks [?]

Need Help? Call a Calibration Engineer 1-800-884-4967

We're open Mo-Fr 8:30am to 5:00pm ET


  • All-welded metal construction
  • No gaskets or bolts
  • 2.5 & 3.5in gauges from 15 to 1000 psi
  • 4.5in gauges from 30 to 1000 psi
  • Top housing material 316L stainless steel standard
  • Diaphragm materials:
    • 316L stainless steel
    • Hastelloy C
    • Tantalum
  • 1/4 NPT or 1/2 NPT instrument connections

This product is an accessory for the following products:

Ashcroft 1009 Analog Pressure Gauges
Stainless steel analog pressure gauge for pressures up to 30,000 psi with ±1% full scale accuracy
In Stock
Ashcroft 1036 In-Line Sanitary Gauge
Designed specifically for the pharmaceutical, biotechnology & food processing markets
Ashcroft 1082 Test Gauge
Test gauge with externally adjustable dial
Ashcroft 1109 Pressure Gauge
Solid front case design with full blowout back
Ashcroft 1125 / 1125A Differential Pressure Gauges
4.5 and 6 inch dial sizes, bronze Bourdon tube & socket
Ashcroft 1127 / 1128 Differential Pressure Gauges
316 stainless steel wetted parts, 4.5 or 6 inch dial sizes
Ashcroft 1130 Series Differential Pressure Gauges
Analog differential pressure gauges constructed with a stainless steel case with a choice of aluminum, brass, or stainless steel body
Ashcroft 1180 Series Analog Low Pressure Gauge
Bellows gauge for low pressure applications available in 4.5 and 6in dial sizes
Ashcroft 1259 Analog Pressure Gauges
Analog process gauge features 0.5% accuracy & ranges up to 20,000 psi
Ashcroft 1279 Duragauge Pressure Gauge
Available with PLUS! Performance, pressure ranges from VAC to 30,000psi, 4.5in dial, phenolic case and blow-out back for safety
Ashcroft 1377 Duragauge Pressure Gauge
Duragauge pressure gauge designed for flush mounting
In Stock
Ashcroft 1379 Duragauge Pressure Gauge
Duragauge pressure gauge with solid-front aluminum case
In Stock
Ashcroft 1490 Analog Low Pressure Gauge
Analog pressure gauge with diaphragm sensing element for pressures below 15 psi
Ashcroft 2030 Series Digital Sanitary Gauge
One multi-function gauge that acts as a mechanical pressure gauge, transducer & switch
Ashcroft 2074, 2174, and 2274 Digital Industrial Gauges
Multi-functional digital gauge with optional 4-20mA output and 1 or 2 SPDT switches
Ashcroft 2089, 2086 and 2084 Precision Digital Test Gauges
Precision digital test gauges with industry leading accuracy
In Stock
Ashcroft 2462 Duragauge Pressure Gauge
General purpose gauge with 4.5in dial that looks like a 6in dial when viewed from the front
Ashcroft 5503 Differential Pressure Gauge
1450 psi static pressure standard with optional static pressure to 3625 psi
Ashcroft A4A Precision Dial Pressure Gauge
Ranges from 15 to 100,000 psi and ±0.1% full-scale accuracy
Ashcroft DG25 Digital Pressure Gauge
0.5% accuracy, bar graph display, vacuum & compound ranges from -14.7 to 25,000 psi
Ashcroft F5509 / F6509 Differential Pressure Gauge
316L Stainless steel case and wetted parts, ±1.6% accuracy, high static pressure limits
Ashcroft Type 1032 Sanitary Pressure Gauge
Sanitary pressure gauges that can be autoclaved or sterilized in place to temperatures of 300°F
Ashcroft Type 1084 Pocket Test Gauge
Stainless steel 3in pocket test gauge with ±0.5% accuracy
Ashcroft D1005PS Digital Gauge
General purpose digital gauge ±0.5% full scale accuracy

The Ashcroft Type 311 / 312 diaphragm seal is compact in size to fit into space restricted areas. It is designed to protect transducers, mini-switches, and pressure gauges with 3.5 inch or smaller dial sizes from corrosion, plugging or freeze-up. The all-welded metal construction prevents process media leakage. It is rated for 2500 psi at 100°F and has a 316L stainless steel top housing standard. Lower housing materials include 316L stainless steel or Hastelloy C. Diaphragm materials include 316L stainless, Hastelloy C, or Tantalum. 1/4, 1/2, 3/4 or 1 NPT process connection sizes are available and the instrument connection is 1/4 or 1/2 NPT.