REF: 600: D&G , DIAM: 3/8" REF: 600: D&G , DIAM: 1/2" REF: 600: D&G , DIAM: 3/4" REF: 600: D&G , DIAM: 1" REF: 600: D&G , DIAM: 1.1/4" REF: 600: D&G , DIAM: 1.1/2" REF: 600: D&G , DIAM: 2"