We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Ashcroft 451379 vacuum gauge black aluminum case glass lens 4 1/2 in dial white scale 30 to 0 IP66 NEMA 4X bottom connection

Ashcroft

Ashcroft 451379SSL04LVAC Pressure Gauge 30 to 0 4-1/2 in

SKU CH-NF81-95G80

A process vacuum gauge with a 4 1/2 in dial, ±0.5% accuracy, IP66 and NEMA 4X protection, and a 1/2 in NPT bottom connection

  • TypeElectronic
  • +/- 0.5% accuracy for precise vacuum readings
  • IP66 / NEMA 4X rating protects against dust and water jets
  • 4-1/2 in dial with white face for clear visibility
  • 1/2 in NPT male bottom connection fits standard piping
  • Field-fillable case allows liquid dampening if required

Process Vacuum Gauge 30 to 0

This Ashcroft process vacuum gauge measures pressure from 30 to 0 with a nominal dial size of 4 1/2 inches. It features an aluminum case with a black phenolic or thermoplastic finish and a glass lens. The gauge offers an accuracy of plus or minus .5 percent and carries an IP66 and NEMA 4X rating for dust and water protection.

1/2 Inch NPT Bottom Connection

The instrument uses a 1/2 inch male NPT process connection located at the bottom of the case. This replaces gauges with smaller dial sizes, different connection types, or lower accuracy ratings when precise vacuum monitoring is required. The jump is worth it for applications needing the 4 1/2 inch dial readability and the IP66 NEMA 4X environmental sealing in harsh conditions.

Field Fillable Liquid Filled Design

The gauge is field fillable and uses liquid filled vibration resistance with no dry dampening feature. Installation involves threading the 1/2 inch male NPT connection into a female port using appropriate sealant. What usually goes wrong is over tightening the connection which can damage the aluminum case or strip the threads, and failing to fill the case properly if liquid damping is desired for vibration prone environments.

Highlights

  • +/- 0.5% accuracy for precise vacuum readings
  • IP66 / NEMA 4X rating protects against dust and water jets
  • 4-1/2 in dial with white face for clear visibility
  • 1/2 in NPT male bottom connection fits standard piping
  • Field-fillable case allows liquid dampening if required

Specifications

BrandASHCROFT
TypeElectronic

Questions about this item

What size NPT thread does the 1/2 in process connection use for mounting?

The gauge has a 1/2 in male NPT bottom connection, so it threads directly into a matching female NPT port without extra adapters.

Which step is most often missed when installing this bottom-mount gauge?

Apply PTFE tape or thread sealant on the 1/2 in male NPT threads and tighten with a wrench on the aluminum case flats, not by turning the dial.

Can the glass lens be replaced if it cracks, and is the case field-fillable?

Yes, the case is field-fillable and the glass lens can be swapped out, allowing on-site refill or lens replacement without removing the gauge from the line.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.