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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
despite the fluctuations in the mains water supply pressure from the streets
Thread Size: Water inlet 1/2" BSP (15mm) Male MI thread
Made in Italy
The AVG PTRE15-1000-LF is cross compatible with other popular makes such as Reliance HTE55-1 PTR valve with same fitments and functions
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
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