Apollo 20-104-03 includes one top valve and one bottom valve. Gauge glass and guard rods are not included.
This standard-pattern bronze water-gauge valve set provides the upper and lower connections for a liquid-level sight glass. It has 1/2-inch male NPT vessel connections, accepts 5/8-inch outside-diameter gauge glass, and uses aluminum handwheels for manual operation.
The -03 configuration supplies the two valves without the glass and rods supplied in a complete -00 gauge. Use it when you need the valve pair and will select the remaining gauge components for the installation. It is not a box of two identical top valves or two complete gauge sets.
Technical specifications
| Specification |
Detail |
| Manufacturer part number |
20-104-03 |
| Series |
Apollo 20-100, standard pattern |
| Valve body / handwheels |
Bronze / aluminum |
| Vessel connection |
1/2-inch male NPT |
| Gauge-glass connection |
5/8-inch outside diameter |
| Glass packing |
EPDM |
| Valve pressure-temperature ratings |
300 psig at 100°F; 125 psig at 350°F, subject to gauge-glass limitations |
Complete the gauge assembly
| Component |
Supply configuration |
| Upper valve |
One included |
| Lower valve |
One included, with 1/4-inch needle drain |
| Gauge glass |
Not included; select the correct diameter, length and service rating. |
| Guard rods |
Not included; select the appropriate protective components. |
| Automatic ball checks |
Not part of the standard 20-104 configuration; do not confuse it with the automatic 20-150 series. |
The operating limit belongs to the complete gauge assembly, not just the bronze valves. Gauge-glass size, length, material and seals can reduce the allowable pressure or temperature. Have trained personnel select and install the assembly, and use the required protection against glass breakage.
Before ordering
| Check |
Ordering guidance |
| Vessel tappings and glass |
Confirm 1/2-inch female NPT tappings, 5/8-inch glass outside diameter and the required installed glass length. |
| Service conditions |
Check fluid compatibility and the pressure-temperature limits of the valves, glass and seals together. |
| Lead-free requirement |
This is the standard bronze model, not a 20LF lead-free model. Do not select it when a lead-free valve is required. |
| Installation and maintenance |
Use new gauge glass and glass packings. Do not overtighten glass nuts or clean the gauge while pressurized. Follow Apollo installation instructions. |
Need help completing a water-gauge assembly? Contact UnitedBuilt through online chat, email parts@unitedbuilt.com, or call 602-253-7750 with your connection size, required glass length and service conditions.
