The espresso machine brand Astoria CMA does use on a variety of their espresso machines sight glasses to check the water level inside the boiler. The sight glass is a ideal tool to check if there is something going wrong with your espresso machine.
The sight glass on a Astoria espresso machine exists out of a upper and lower fitting. In-between these fittings is a sight glass located which has a diameter of 11mm and a length of 170mm. this sight glass is sealed with a flat gasket and held in place with a brass washer and fastening nut. This model of sight glass can be found on the Astoria Brava, Astoria Divina, Astoria Dora, Astoria Gloria, Astoria Perla and the Astoria Pratic.
The Astoria Rapallo does have a different lower and upper valve, so these components are not identical to the items described above.
