Release Line Hangers Release line hangers are for supporting 1/2” (15 mm) release line piping from system piping. Order for system pipe sizes 1”, 1-1/4”, 1-1/2”, 2”, 2-1/2”, 3”, 3-1/2”, 4”, 5”, 6”, and 8” (25 mm, 32 mm, 40 mm, 50 mm, 65 mm, 80 mm, 90 mm, 100 mm, 125 mm, 150 mm, and 200 mm). Operation Indicator Operation Indicator, Viking Part Number 02944A consists of a brass insert and orange plastic cap. The release operation indicator is installed in the 1/2” (15 mm) drain outlet of the release. When the release operates, the plastic cap of the operation indicator will blow open at 2 psi (14 kPa), thus indicating which release has operated. Release Setting Tool Kit Release Setting Tool Kit, Viking Part Number 01714A, consists of one 3/16” (4,76 mm) Allen wrench, with a special Schrader core removing end, one 0.025” (0,635 mm) feeler gauge, one 0.018” (0,457 mm) feeler gauge, and five replacement Schrader valve cores.