Product Variation:

HW309 Series

Marsh Instruments Severe Service Liquid Filled Gauges are designed to perform in rugged and harsh environmental conditions, especially where pulsation or vibration is a problem. Liquid Filled Gauges offer a significant cushioning and dampening effect, reducing flutter and lubricating the internals.
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Variations: HW30942, HW30942P, HW30942PI, HW30942E, HW30942PE, HW30942PIE, HW30942L1, HW30942PL1, HW30942PIL1, HW30942L2, HW30942PL2, HW30942PIL2, HW30942L3, HW30942PL3, HW30942PIL3, HW30942L4, HW30942PL4, HW30942PIL4, HW30942W1, HW30942PW1, HW30942PIW1, HW30942W2, HW30942PW2, HW30942PIW2, HW30942W4, HW30942PW4, HW30942PIW4, HW30946, HW30946P, HW30946PI, HW30946E, HW30946PE, HW30946PIE, HW30946L1, HW30946PL1, HW30946PIL1, HW30946L2, HW30946PL2, HW30946PIL2, HW30946L3, HW30946PL3, HW30946PIL3, HW30946L4, HW30946PL4, HW30946PIL4, HW30946W1, HW30946PW1, HW30946PIW1, HW30946W2, HW30946PW2, HW30946PIW2, HW30946W4, HW30946PW4, HW30946PIW4, HW30948, HW30948P, HW30948PI, HW30948E, HW30948PE, HW30948PIE, HW30948L1, HW30948PL1, HW30948PIL1, HW30948L2, HW30948PL2, HW30948PIL2, HW30948L3, HW30948PL3, HW30948PIL3, HW30948L4, HW30948PL4, HW30948PIL4, HW30948W1, HW30948PW1, HW30948PIW1, HW30948W2, HW30948PW2, HW30948PIW2, HW30948W4, HW30948PW4, HW30948PIW4, HW30952, HW30952P, HW30952PI, HW30952E, HW30952PE, HW30952PIE, HW30952L1, HW30952PL1, HW30952PIL1, HW30952L2, HW30952PL2, HW30952PIL2, HW30952L3, HW30952PL3, HW30952PIL3, HW30952L4, HW30952PL4, HW30952PIL4, HW30952W1, HW30952PW1, HW30952PIW1, HW30952W2, HW30952PW2, HW30952PIW2, HW30952W4, HW30952PW4, HW30952PIW4, HW30954, HW30954P, HW30954PI, HW30954E, HW30954PE, HW30954PIE, HW30954L1, HW30954PL1, HW30954PIL1, HW30954L2, HW30954PL2, HW30954PIL2, HW30954L3, HW30954PL3, HW30954PIL3, HW30954L4, HW30954PL4, HW30954PIL4, HW30954W1, HW30954PW1, HW30954PIW1, HW30954W2, HW30954PW2, HW30954PIW2, HW30954W4, HW30954PW4, HW30954PIW4, HW30958, HW30958P, HW30958PI, HW30958E, HW30958PE, HW30958PIE, HW30958L1, HW30958PL1, HW30958PIL1, HW30958L2, HW30958PL2, HW30958PIL2, HW30958L3, HW30958PL3, HW30958PIL3, HW30958L4, HW30958PL4, HW30958PIL4, HW30958W1, HW30958PW1, HW30958PIW1, HW30958W2, HW30958PW2, HW30958PIW2, HW30958W4, HW30958PW4, HW30958PIW4, HW30960, HW30960P, HW30960PI, HW30960E, HW30960PE, HW30960PIE, HW30960L1, HW30960PL1, HW30960PIL1, HW30960L2, HW30960PL2, HW30960PIL2, HW30960L3, HW30960PL3, HW30960PIL3, HW30960L4, HW30960PL4, HW30960PIL4, HW30960W1, HW30960PW1, HW30960PIW1, HW30960W2, HW30960PW2, HW30960PIW2, HW30960W4, HW30960PW4, HW30960PIW4, HW30964, HW30964P, HW30964PI, HW30964E, HW30964PE, HW30964PIE, HW30964L1, HW30964PL1, HW30964PIL1, HW30964L2, HW30964PL2, HW30964PIL2, HW30964L3, HW30964PL3, HW30964PIL3, HW30964L4, HW30964PL4, HW30964PIL4, HW30964W1, HW30964PW1, HW30964PIW1, HW30964W2, HW30964PW2, HW30964PIW2, HW30964W4, HW30964PW4, HW30964PIW4, HW30972, HW30972P, HW30972PI, HW30972E, HW30972PE, HW30972PIE, HW30972L1, HW30972PL1, HW30972PIL1, HW30972L2, HW30972PL2, HW30972PIL2, HW30972L3, HW30972PL3, HW30972PIL3, HW30972L4, HW30972PL4, HW30972PIL4, HW30972W1, HW30972PW1, HW30972PIW1, HW30972W2, HW30972PW2, HW30972PIW2, HW30972W4, HW30972PW4, HW30972PIW4, HW30974, HW30974P, HW30974PI, HW30974E, HW30974PE, HW30974PIE, HW30974L1, HW30974PL1, HW30974PIL1, HW30974L2, HW30974PL2, HW30974PIL2, HW30974L3, HW30974PL3, HW30974PIL3, HW30974L4, HW30974PL4, HW30974PIL4, HW30974W1, HW30974PW1, HW30974PIW1, HW30974W2, HW30974PW2, HW30974PIW2, HW30974W4, HW30974PW4, HW30974PIW4, HW30976, HW30976P, HW30976PI, HW30976E, HW30976PE, HW30976PIE, HW30976L1, HW30976PL1, HW30976PIL1, HW30976L2, HW30976PL2, HW30976PIL2, HW30976L3, HW30976PL3, HW30976PIL3, HW30976L4, HW30976PL4, HW30976PIL4, HW30976W1, HW30976PW1, HW30976PIW1, HW30976W2, HW30976PW2, HW30976PIW2, HW30976W4, HW30976PW4, HW30976PIW4, HW30978, HW30978P, HW30978PI, HW30978E, HW30978PE, HW30978PIE, HW30978L1, HW30978PL1, HW30978PIL1, HW30978L2, HW30978PL2, HW30978PIL2, HW30978L3, HW30978PL3, HW30978PIL3, HW30978L4, HW30978PL4, HW30978PIL4, HW30978W1, HW30978PW1, HW30978PIW1, HW30978W2, HW30978PW2, HW30978PIW2, HW30978W4, HW30978PW4, HW30978PIW4, HW30982, HW30982P, HW30982PI, HW30982E, HW30982PE, HW30982PIE, HW30982L1, HW30982PL1, HW30982PIL1, HW30982L2, HW30982PL2, HW30982PIL2, HW30982L3, HW30982PL3, HW30982PIL3, HW30982L4, HW30982PL4, HW30982PIL4, HW30982W1, HW30982PW1, HW30982PIW1, HW30982W2, HW30982PW2, HW30982PIW2, HW30982W4, HW30982PW4, HW30982PIW4, HW30990, HW30990P, HW30990PI, HW30990E, HW30990PE, HW30990PIE, HW30990L1, HW30990PL1, HW30990PIL1, HW30990L2, HW30990PL2, HW30990PIL2, HW30990L3, HW30990PL3, HW30990PIL3, HW30990L4, HW30990PL4, HW30990PIL4, HW30990W1, HW30990PW1, HW30990PIW1, HW30990W2, HW30990PW2, HW30990PIW2, HW30990W4, HW30990PW4, HW30990PIW4, HW30994, HW30994P, HW30994PI, HW30994E, HW30994PE, HW30994PIE, HW30994L1, HW30994PL1, HW30994PIL1, HW30994L2, HW30994PL2, HW30994PIL2, HW30994L3, HW30994PL3, HW30994PIL3, HW30994L4, HW30994PL4, HW30994PIL4, HW30994W1, HW30994PW1, HW30994PIW1, HW30994W2, HW30994PW2, HW30994PIW2, HW30994W4, HW30994PW4, HW30994PIW4




  • Large, Easy to Read Dial
  • Durable Welded Case to Socket Connection
  • 1% Full Scale Accuracy


  • Industrial
  • Oil & Gas
  • Commercial
  • Hydraulic
  • Pneumatic

Additional information

Spec accuracy

1% of Full Scale (ASME Grade A)


304 Stainless Steel – Removable


1/2 NPT- Lower Mount


Meets/Exceeds ASME B40.100


Aluminum, Black Painted, Micro Adjustable


Lower Mount

Vent plug

Filler/Pressure Relief Plug


1% of Full Scale (ASME Grade A)


Filled, Fillable – Severe Service


HW309 Series

Dial color

Black Markings on White

Dial size


Pressure ranges

VAC/Compound to 20,000 psi


304 Stainless Steel

Standard case fill

Dry, Glycerine, Silicone


Safety Glass


Stainless Steel

Dial sizes


Ambient temperature

Dry: -40 to 180F, Glycerine: 30 to 160F, Silicone: -40 to 180F

Internal material

316 Stainless Steel

Tube socket

316 Stainless Steel

Standard scale

Dual Scale psi/kpa


see variation page