The Miljoco-Weiss LF251Z-600-4L is a Weiss liquid filled pressure gauge with a 2-1/2″ dial, a 0-600 psi pressure range and a 1/4″ NPT lower connection.
These American made liquid filled pressure gauges come standard in a tough, corrosion and impact resistant Zytel nylon case.
They are fully filled because an internal breathing diaphragm eliminates the need for an air bubble in the mid-range of the gauge, and the standard fill is non-yellowing, crystal clear glycerine.
Specifications on this page are taken from the Weiss Made in USA Liquid Filled Pressure Gauges bulletin (LFZ-06/20). Verified 2026-09-11.
Markets
The manufacturer lists this series for the following applications.
- Mobile hydraulic equipment
- Irrigation and water purification
- Waste water
- Food and pharmaceutical
- Bulk transport trailers
- Military and marine
- Chemical plants
- Refineries
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
Made in USA
The Weiss LFZ bulletin identifies these liquid filled gauges as Made in USA.
Zytel nylon case
Corrosion and impact resistant black Zytel nylon case with a removable Zytel bezel.
Fully filled design
An internal breathing diaphragm eliminates the air bubble in the mid-range of the gauge.
Bronze Bourdon tube
Bronze tube with brass socket.
Accuracy ANSI B40.1 Grade A
Published at Grade A, 2-1/2%.
Technical Specifications
| Model | LF251Z-600-4L |
| Type | Glycerin filled pressure gauge, Zytel nylon case |
| Ordering Code | Series LF251Z, range code 600, connection code 4L |
| Range | 0-600 psi |
| Dial Size | 2.5″ |
| Case | Zytel nylon, black |
| Bezel | Zytel nylon, removable |
| Lens | Acrylic |
| Dial | White aluminum |
| Pointer | Black aluminum |
| Bourdon Tube | Bronze |
| Socket | Brass |
| Fill | High purity glycerin, fully filled with internal breathing diaphragm |
| Ambient Temperature | -40 to 150°F |
| Accuracy | ANSI B40.1 Grade A, 2-1/2% |
| Connection | 1/4″ NPT lower |
| Country of Origin | Made in USA (per bulletin) |
Documentation
Related Products
Frequently Asked Questions
What range does the LF251Z-600-4L read?
0-600 psi. Figure interval 100 psi, minor graduation 10 psi.
What is the process connection?
1/4″ NPT lower.
How accurate is it?
The published accuracy for this series is ANSI B40.1 Grade A, 2-1/2%.
What are the wetted materials?
Bourdon Tube: Bronze; Socket: Brass.
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:
- LF251Z
- Dial Size:
- 2-1/2 in
- Pressure Range:
- 0-600 psi
- Range Type:
- Pressure
- Connection Size:
- 1/4 in
- Connection Location:
- Lower
- Case Material:
- Zytel Nylon
- Wetted Material:
- Bronze
- Fill:
- Glycerine
- Country of Origin:
- USA
