1 – BOILER CAP

The boiler cap was initially metal and tightened outside the boiler.
He suffered a substantial change in the first 70 years by changing screwing from external to internal boiler, with thread made of brass.
At the end of 90 years was replaced filleting brass with cheaper plastic.
Too bad that with the excessive heat can melt the screw with leaking water and possible damage to resistance.

TYPE	FEATURES	START PRODUCTION	END PRODUCTION	MATERIAL	WEIGHT	DIMENSIONS	AVAILABLE
	Metal Cap Model with external screwing	1959	1962	Bakelite-steel	158 gr	6,0 cm x 5,0 cm	no
	Metal Cap Similar to the previous with different designs and red circular area on the top	1959	1962	Bakelite-steel	141 gr	6,0 cm x 5,0 cm	no
	Bakelite and Brass Cap Similar to the previous without red circular area on the top	1959	1973	Bakelite-brass	122 gr	6,0 cm x 5,0 cm	no
	Bakelite and Brass Cap old model model with internal screwing	1974	1990	Bakelite-brass	147 gr	6,0 cm x 5,0 cm	no
	Bakelite and Brass Cap new model Modello con avvitatura interna alla caldaia	1991	1999	Bakelite-brass	170 gr	6,0 cm x 6,5 cm	no
	Wood and brass Cap new model	1992	1999	Wood-brass	153 gr	6,0 cm x 6,5 cm	no
	Plastic Cap new model model entirely in plastic	2000	oggi	Plastic	122 gr	6,0 cm x 6,5 cm	yes
	Wood Cap new model wood model with plastic thread	2000	oggi	Wood-plastic	83 gr	6,0 cm x 6,5 cm	yes