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What's this called?
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Hilly
Member Posts: 429
Is this fitting more of a HVAC style fitting? I have seen them a few times over the years but only ever on hydronics and never in a plumbing system. Friend sent me his find today because he'd never seen such a creature before.

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Perhaps it's a supply and return tee?
http://www.nibco.com/Fittings/Metal-Fittings/Pressure-Fittings/Cast-Copper-Pressure-Fittings/711-A-Supply-and-Return-Tee-C-x-C-x-C-Cast/
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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If there is a pump on the boiler, it looks to be a primary secondary loop with the branch secondaries off either side
Although pipe sizing is suspect?Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0
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