Zoro Select
Zoro Select 102-003NL boiler drain valve 1/2 in MPT x MPT brass
Brass boiler drain valve with 1/2 in MPT inlet, 3/4 in GHT outlet, 125 psi rating and 180 °F maximum temperature
- Solid brass body resists corrosion for long service life
- Rated to 125 psi and 180 °F for standard boiler duty
- Multi-turn wheel handle gives precise flow control
- Meets ANSI, ASME, CSA and NSF/ANSI 372 standards
- Compact 3.25 in length fits tight piping spaces
Zoro Select 102-003NL Boiler Drain Valve
This brass boiler drain valve fits hydronic heating systems and water heaters where a 1/2 inch male pipe thread inlet is required. It provides a reliable shut-off point for draining or servicing the system. The valve meets ANSI, ASME, CSA and NSF standards for potable water and heating applications. Installers and maintenance technicians will find it suited for standard residential and light commercial boiler installations.
Thermals noise and power draw
The brass body handles hot water up to 180 degrees Fahrenheit at a maximum working pressure of 125 psi. As a manual valve it consumes no electrical power and produces no operational noise during normal use. The multi-turn wheel handle allows gradual flow control to prevent water hammer when opening or closing. Temperature and pressure ratings match typical closed-loop heating system parameters.
Build quality and daily implications
The valve body is constructed from brass with a cast iron wheel handle for durability. Inlet connection is 1/2 inch MPT male pipe thread while the outlet is 3/4 inch male hose thread (GHT). Overall length measures 3.25 inches, which determines the space needed between the boiler tapping and any adjacent obstruction. The MPT x MHT configuration lets you connect a standard garden hose directly for draining without an adapter. Compliance with NSF/ANSI 372 confirms lead-free construction for potable water safety.
Highlights
- Solid brass body resists corrosion for long service life
- Rated to 125 psi and 180 °F for standard boiler duty
- Multi-turn wheel handle gives precise flow control
- Meets ANSI, ASME, CSA and NSF/ANSI 372 standards
- Compact 3.25 in length fits tight piping spaces
Specifications
| Brand | ZORO SELECT |
|---|
Questions about this item
How do I install the 1/2 in MPT inlet on this boiler drain valve, and what step is often missed?
Wrap PTFE tape clockwise on the 1/2 in male pipe threads, thread into the boiler tapping, and tighten with a wrench on the brass body flats; the step often missed is using pipe sealant on the 3/4 in GHT outlet before attaching a hose.
What maintenance or replacement will the wheel handle and brass body need over time?
The cast-iron wheel handle may loosen on the stem — retighten the set screw annually; replace the valve if the brass body shows dezincification or the seat leaks at 125 psi.
At what temperature limit does the valve first reach its rating under sustained hot-water use?
The maximum media temperature is 180 Degrees F; sustained operation at or above this limit will stress the brass body and seals before the 125 psi pressure rating is reached.
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