FNPT Union x Push-Fit
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Comments about 3/4" Push-Fit Isolator E-X-P E2 Tankless Water Heater Service Valve Kit w/ 150 PSI Pressure Relief Valve (Lead Free)
I originally ordered the NPT input side Isolator from SupplyHouse and realized my space was tight. The Push-Fit connections gave me the extra 1.25 inches of clearance I needed under the boiler. Unless you're installing dozens of these a year, the extra cost ($20) is worth it. I used Sharkbite connectors throughout my boiler installation.