The GReddy dual-bead boost clamp No. 28 fits 39–56mm tubing and is finished in black. This dual-bead clamp is offered to secure boost hoses and intercooler plumbing sized in the 39 to 56 millimeter range, using GReddy's No. 28 clamp profile to provide a secure mechanical connection for boost system hose joints within that diameter range.
GReddy 39-56mm / No. 28 Dual-Bead Boost Clamp - Black