Sealing quality was classified as: 1: no leaks; 2: leak <200 ml; 3: leak >200 ml which corrects itself with flow increased to 2 litres; 4: leak >200 ml which does not correct itself.
La calidad de sello se clasificaba como: 1: sin fugas; 2: fuga <200 ml; 3: fuga >200 ml que corrige con aumento de flujo a 2 litros; y 4: fuga >200 ml que no corrige.