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Caleffi 553542A 553 Series Auto Fill Boiler Feed Valve 1/2″NPT Inlet Furnish and install on the plans and described herein a Caleffi AutoFill pre-adjustable automatic filling valve as manufactured by Caleffi. Each valve must be designed with a visual system pressure setting indicator. The filling valve design must include a brass body nylon plastic cover sliding surfaces in anti-scale plastic diaphram and seals in NBR and removable cartridge for maintenance operations. The filling valve must have a pressure indicator for pre-adjustment of device accuracy 2 psi 0.15 bar. Complete with isolating valve and filter. Integral downstream pressure gauge 0-60 psi/0-4 bar for codes 553642A and 553649A.