Breville Coffee Boiler Assembly (Compression Fittings) Coffee boiler (compression fittings) version is not compatible with (O-ring connections) version and need to include the following: 1 x BES990/05.01A T-TUBE STEAM BOILER TO COFFEE BOILER (SP0024204) 1 x BES990/03.21A T-TUBE COFFEE BOILER TO SHOWER HEAD (SP0024203)