Ordering Description Product number Description: Tweco MS52T-11 Gas Diffuser, Brass Product number: 1520-1133 Description: Tweco HD52-11 Gas Diffuser, Brass, Eliminator Product number: 1520-1130 Description: Tweco 52HD-11 Gas Diffuser, Brass Product number: 1520-1103 Description: Tweco 52FN Gas Diffuser, Brass Product number: 1520-1102 Description: Tweco 52 Gas Diffuser, Brass Product number: 1520-1101 Description: Tweco 52-23 Gas Diffuser, Brass Product number: 1520-1100