www.pmmag.com/articles/99810-solar-water-heating-collectors

Solar water-heating collectors
Caleffi’s StarMax V solar water-heating collectors are used for pumped glycol and drainback systems.
June 17, 2013
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Caleffi’s StarMax V solar water-heating collectors are used for pumped glycol and drainback systems. The patented design is shaped similar to a standard four-outlet collector but features a fifth outlet located at the bottom center.
Additionally, the internal upper and lower headers are sloped. When used in a drainback installation, this combination allows all fluid to drain without the need to pitch the collectors.