509: Brass automatic power supply unit, for closed heating system circuits, with strainer, non-return valve and stop cock, heavy type, ¼ “pressure gauge socket.
519: Brass boiler drain plug cock
For thick liquids
516: Brass valve for thick liquids, “PERFECT”
For article 519 and 516: No maintenance is required
For article 509: Installation and subsequent interventions on the product must be carried out by qualified personnel, with suitable instruments.