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The small black plastic part opposite the discharge port is called an auxiliary and serves as an emergency fail safe device by blowing itself out in case of a blockage in the discharge drain pipe
Thread Size: Water inlet 1/2" BSP (15mm) Male MI thread
The genuine Deks DFE104B 75–175mm (3–7") Black EPDM Dektite Premium #4 is ideal for roof penetration applications such as pipes
Made in Italy
1/2" (15mm) Male Outlet
CALEFFI Solar Hot Water Anti Frost Protection Valve 15mm 1/2" Female Thread Extension Fitting:No Extension The small black plastic partOverview CALEFFI 15mm (1 2inch) 603040 solar frost protection anti freeze valve for solar thermal systems to protect hot water storage. Prevents ice built up in domestic water circuits avoiding possible damage to water storages and pipes in hydraulic, solar and irrigation systems. Made in Italy. Australian Watermark approved. Technical Details Manufacturer: CALEFFI, Made in Italy Model: 603040 Specifications: Opening Temperature: 3C Closing