The Miljoco-Weiss 4CTA-1-V300-4L is a Weiss HVAC pressure gauge with a 4-1/2″ dial, a 30″Hg-0-300 psi compound range and a 1/4″ NPT lower connection.
The Weiss HVAC gauges meet the specifications of contractors in heating, plumbing, air conditioning and ventilating applications.
This series is intended for general service conditions, for pressure or vacuum on air, oil, water, gas or other mediums that do not attack brass.
Specifications on this page are taken from the Weiss Series 4CTA-1 submittal; Weiss 4CTA/4CTS HVAC gauge instructions. Verified 2026-09-11.
Markets
The manufacturer lists this series for the following applications.
- Heating
- Plumbing
- Air conditioning
- Ventilating
Warranty
Miljoco-Weiss warrants its products to be free from material defects in material and workmanship for 12 months from the date of shipment, or such other period as provided in the product documentation, per the published Miljoco-Weiss terms and conditions of sale (Section 15, Limited Warranty).
Key Features
Lead free wetted parts
Phosphor bronze tube with <0.25% lead free brass socket and lead free solder connection.
UL to NSF/ANSI 372/61
Certified by UL in accordance with NSF/ANSI 372/61.
Accuracy ±1%, Grade 1A
ANSI-ASME B40.1 Grade 1A.
Stainless Steel Back Flange Case
Stainless steel back flange with push-in Lexan window.
Brass movement
All brass construction with precision gear and pinion.
Technical Specifications
| Model | 4CTA-1-V300-4L |
| Type | HVAC pressure gauge, lead free |
| Ordering Code | Series 4CTA-1, range code V300, connection code 4L |
| Range | 30″Hg-0-300 psi |
| Graduations | Figure interval 30″Hg / 50 psi, minor graduation 10″Hg / 5 psi |
| Dial Size | 4-1/2″ |
| Case | Stainless steel back flange with push-in Lexan window |
| Tube | Phosphor bronze |
| Socket | <0.25% lead free brass |
| Solder Connection | Lead free |
| Dial | White coated metal lithographed with black graduation lines and numerals |
| Movement | All brass construction, precision gear and pinion |
| Pointer | Slotted adjustable |
| Accuracy | ±1% ANSI-ASME B40.1 Grade 1A |
| Connection | 1/4″ NPT lower |
| Certification | UL in accordance with NSF/ANSI 372/61 |
| Operating Temperature | Ambient -40°F to 140°F (-40°C to 60°C); media 180°F (85°C) maximum |
| Dimensions (in.) | A 5.81, B 1.37, C 4.75, D 3.37, E 2.37 |
| Options | Red set hand |
Service note. Steam service gauges should be protected from excessive temperature by the installation of a coil type syphon (Cat. No. SY14-S iron or SY14-B brass).
Source Notes
Source note: Document source. Construction, temperature, accuracy and graduation values on this page are taken from the official Weiss Series 4CTA-1 submittal, linked below, rather than from the shared General Service Gauges catalog page that covers all three HVAC gauge series.
Documentation
Related Products
Frequently Asked Questions
What range does the 4CTA-1-V300-4L read?
30″Hg-0-300 psi. Figure interval 30″Hg / 50 psi, minor graduation 10″Hg / 5 psi.
What is the process connection?
1/4″ NPT lower.
How accurate is it?
The published accuracy for this series is ±1% ANSI-ASME B40.1 Grade 1A.
What are the wetted materials?
Tube: Phosphor bronze; Socket: <0.25% lead free brass.
Is there a service warning for this gauge?
Yes. For steam service the manufacturer specifies a coil type syphon (SY14-S iron or SY14-B brass) ahead of the gauge to guard against excessive temperature.
Manufacturer Warranty
Miljoco-Weiss warrants this product to be free from material defects in material and workmanship for 12 months from date of shipment, per the published Miljoco-Weiss terms and conditions of sale.
Warranty service requires written notice of the defect within seven days of discovery. Remedy is repair, replacement or credit at the manufacturer's discretion. Normal wear, corrosion, misuse and unauthorized modification are excluded.
- Type:
- Pressure Gauge
- Series:
- 4CTA-1
- Dial Size:
- 4-1/2 in
- Pressure Range:
- 30 inHg-0-300 psi
- Range Type:
- Compound
- Connection Size:
- 1/4 in
- Connection Location:
- Lower
- Case Material:
- Stainless Steel
- Wetted Material:
- Lead Free Brass
- Fill:
- Dry
- Accuracy:
- Plus or Minus 1 Percent
