The UL Rain Tester System is compounded by three spray heads mounted in a water supply pipe frame, as the design suggested by UL 1278, NEMA 250 and UL 1598; these standards also specify the spray head nozzles.
 
UL Rain Tester
The UL Rain Tester is compounded by three spray heads mounted in a water supply pipe frame, as the design suggested by UL 1278 and UL 1598; these standards also specify the spray head nozzles.
Complies with various IEC, EN, CE, VDE, UL & CSA requirements

Application
To perform tests with this apparatus, you will need a water supply to maintain a pressure of 34.5Kpa(5PSI) measured by a pressure gauge in each spray head.