Heavy Duty clamp for 3" ID Silicone HosesThis heavy duty spring loaded T bolt clamp is used on 3" ID (5 ply) silicone hoses. It is recommended in any air to air application or any application using silicone hoses, especially if you have had trouble with the hose coming off. Spring loaded T bolt clamps assure a firm hold, regardless of the expansion and contraction caused by changes in temperature and pressure. Stainless band and bridge, plated spring and washers, anodized bolt and nut.