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The Asco (previously Sirai) commercial pressurestat for 110~120/220~240V equipment, #P302-6. This is the part that regulates your boiler heating via a diaphragm that expands and contracts as the boiler steam pressure raises and lowers, activating the contacts and sending a signal to the heating element telling it to turn on or off. It is by far the most common pressurestat used historically and today.

European Espresso machine manufactures use British Standard Pipe fittings in their equipment. To measure a fitting, one measures the inside diameter of the male thread on a fitting. In most cases. Specialized fittings of course may have a wider or more narrow opening depending on the application and desired volume or flow rate through the fitting. But for the most part, it's the inside of a male fitting that is measured. A 1/4" Male BSP fitting will measure 13 mm (1/2") on the outside diameter, for what that's worth...

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TECHNICAL NOTES

• CE-SEV-ASE-UL approved
• ISO 228 G connection 1/4"M for pipe 4x6 mm
• adjustable scale 0.5~1.4 bar
• fixed differential 0.15 (0.06) bar
• fluid temperature max: 140° C
• max contact load: 220V 7KW (30A)

Cross-references:
Part numberManufacturer20150ASTORIA CMA7433001BEZZERA5006010BFC00630.4.00.08BRASILIA000399BRUGNETTI-AURORA95.00275CARIMALI531-190-310CIMBALIC199900279ECM00049035ELEKTRA558ESPRESSO RESOURCE60000000EXPOBAR60000005EXPOBAR2231116597FAEMA2231131900FAEMA531190310FAEMA5.2.000.0680FIEMMA RSTA2100050FIORENZATO C.S.A2100314FIORENZATO C.S.FC1669FRACINO07935703FUTURMAT-ARIETE12001274GAGGIAWGADM0541GAGGIA07935703GAGGIA SPAGNA (SPAIN)1160800015GRIMAC1160800016GRIMACA2100314GRIMACGR814GRIMACGR815GRIMACGRC615GRIMACV070GRIMAC07935703ITALCREM10060660LAVAZZA10066203LAVAZZA07935703MAIRALIL270MARZOCCO20150MCE09200006NUOVA SIMONELLID20150ORCHESTRALE451301PAVONI34200110RANCILIO34200111RANCILIO9005050RENEKAGR814RICAMBI GARDOSIGR815RICAMBI GARDOSIGRC615RICAMBI GARDOSIV070RICAMBI GARDOSI5006010ROYALSVTMP010SAB ITALIA1200127SAECOWGADM0541SAECO108007SAN MARCO10602010SANREMO10602010ASANREMOC-0455SCALA01101SPAZIALE02623SPAZIALEELETPREVIBIEMME09200006VICTORIA ARDUINO07935703VISACREMW10440WEGAWY20150WEGASplit

Factory specification sheet click 

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