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Blue low-side HVAC gauge with 2-3/4 inch dial and 350 psi scale

Dayton

Dayton 4PDK4 Low Side Gauge 2-3/4 in Blue 350 psi

SKU CH-NP1S-2EWSA

Measures low-side pressure from 30 in Hg to 350 psi for R-134A systems with a 1/8 in connection

  • ColorBlue
  • Measures low-side pressure up to 350 psi for accurate diagnostics
  • 2-3/4 inch dial provides clear readings at a glance
  • Blue colour coding identifies low-side function instantly
  • Designed for R-134A systems ensuring correct refrigerant compatibility
  • 1/8 inch connection fits standard manifold gauge sets directly

Low-side manifold gauge

This Dayton low-side gauge is built for HVAC service work on R-134A systems. The blue dial face reads vacuum to 350 psi for quick pressure checks during charging or diagnostics. A 1/8 in connection threads onto standard manifold sets without adapters. Technicians use it as a direct replacement when the original gauge is damaged or out of calibration.

Fits standard manifold sets

The 1/8 in connection matches common manifold block ports so the gauge installs with a wrench and thread sealant. Its 2-3/4 in diameter fits the existing panel cut-out on most manifold bodies. The blue colour coding follows industry convention for low-side identification, reducing the chance of cross-connecting hoses. No extra fittings or recalibration are required after installation.

Suits R-134A service only

This gauge is calibrated for R-134A refrigerant and a 30 in Hg to 350 psi range. It will not read correctly on systems using other refrigerants or operating outside that pressure window. Buyers who need high-side readings, multi-refrigerant scales or digital logging should look at a different instrument. The product also carries a Proposition 65 warning for chemical exposure.

Highlights

  • Measures low-side pressure up to 350 psi for accurate diagnostics
  • 2-3/4 inch dial provides clear readings at a glance
  • Blue colour coding identifies low-side function instantly
  • Designed for R-134A systems ensuring correct refrigerant compatibility
  • 1/8 inch connection fits standard manifold gauge sets directly

Specifications

BrandDAYTON
ColorBlue

Questions about this item

How does the 350 psi working pressure limit hold up during sustained refrigerant charging?

The gauge is rated for continuous operation from 30 in Hg vacuum up to 350 psi, so it remains within specification throughout a full R-134A charging session.

Does the blue low-side gauge heat up or vibrate noticeably when left on a running manifold set all day?

The mechanical bourdon tube design produces no electrical heat or vibration; the housing stays at ambient temperature during extended use.

What manifold connection size must my existing gauge set have for this 1/8 in replacement gauge to thread on directly?

Your manifold block needs a 1/8 in NPT female port; the gauge includes a matching male fitting for direct installation.

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