https://www.ebay.com/sch/i.html?_nkw=Allegro+9892+04+4+Cylinder+Airline+Cascade+Kit&_sacat=0&_dmd=2

Allegro 9892-04 4-Cylinder Airline Cascade Kit

$910.00
$671.00

Four Cylinder Airline Cascade Kit, Includes Regulator, (3) Tees, (3) Pigtails, Alarm