| Min Temp (F): | 60°F |
|---|---|
| Application: | Heating Pressure |
| Dial Size: | 3-1/8" |
| Measures: | Celsius Fahrenheit Pressure |
| Temperature Range: | 15° to 160°C |
| Temperature Range (F): | 60°F - 320°F |
| PSI Range: | 0-75 |
| Max Pressure (PSI): | 75 |
| Type: | Dry |
| Connection Type: | 1/4" NPT |
| Length: | 1-21/32" |
| Max Temp (F): | 320ºF |
| Mount: | Back |

Buy a 1"X 1" X 1/2" copper tee. A female adapter 1/2". then a 1/2" X 1/4" black bushing. thread in the Gauge. This should be after the mixing valve on the supply. Have the same one in my house doing in floor. Good Luck
The probe beyond the threaded portion of this gauge measures 1-5/8".
exactly 1 1/2 inches
I have a 25 year old Burham boiler for my hot water heating system. A couple of years ago I noticed that the temperature-pressure gauge had corroded and was unreadable. I knew I needed a replacement with a long probe. I searched and searched and called and called, all to to avail. I finally ordered two that looked like they might work: the Weil Mclain (boiler sizes 85-125, SKU 510-218-097) and the Honeywell-Sparco TD-165. The Weil Mclain gauge was a perfect fit and I ended up discarding the Honeywell gauge. My recollection is that the probe is a couple of inches beyond the threaded portion. In-so-far as each is about $20, and depending on the need, you could do the same thing I did and try a couple that look like the best fit based on all available evidence short of having one in you hands. Howard Levy ***.****
Sorry for the late reply, I rarely use this email address. The probe is 1.5 inches long past the threaded portion I hope this helps...if it is not too late.
This one is on the back.