Brass Union DR 22mm Compression MI European Size Collector Connection
22mm is generally a European size but found in some solar hot water collectors sold in Australia. Early Apricus systems were one of the many brands the had 22mm copper from the collector. The 22mm compression fitting union is normally used to join solar hot water collectors.
The joiner comes complete with brass or copper compression olive. The joiner is used to connect to flat plate solar panels or evacuated tube manifolds outlet/inlet.