Caleffi’s PressCon tailpiece fitting with union nut creates a leak-proof seal and is available in 3/4” press by 1” female union nut, which fits many Caleffi components with 1” male union (straight) thread. The tailpiece is compatible within a working temperature range of 0° F to 250° F for up to 50% glycol mixtures and pressure-rated to 200 psi. The fitting meets 2014 low-lead law requirements.