Pretty rare now, since CMA moved on to use the three-way combination expansion with one way check valve assemblies. Also available in the less common 3/8" x 3/8" version, part AS_232. Releases at 12 bar. Made of low lead content brass CW510L (OT57), the water flows in (pushes towards) the gasket on the inside.
Attention CA Residents: Prop 65 Warning
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.