watts9092"

For use with Qualitrol 900/910 series Rapid Pressure Rise Relays and other instruments to maintain momentary alarm and trip circuits. The relay and LED indicator remains activated until the manual reset button is pressed.

First question I'm trying to identify the right replacement part for a Watts n35b water pressure regulator. A watts LFN45B appears to be the new version of this. It has the same specifications: Range 25-75. The threading set up also looks the same. Is this right?

For power transformers or any other applications which require a momentary contact signal to be maintained. Can be configured for use in AC or DC applications.

watts9091"

Second question - When installing this do I need to solder it or do any other treatment to the threading besides letting the o-rings do the work?

Here is a link to the 45B at lowes: https://www.lowes.com/pd/Watts-LFN45B-Copper-3-4-in-MNPT-Pressure-Reducing-Valve/3503148