This is the 90° Exhaust Adapter for the #744B & #E4010 OSMG2838 mufflers This gives you the flexibility of pointing your muffler up or down. It is ideal for many helicopter installations, where standard muffler mounting is impossible. FEATURES: Natural aluminum construction INCLUDES: One 90° Muffler Adapter Two 4x15mm Cap Head Screws w/.7 pitch threads Two 4x40mm Cap Head Screws w/.7 pitch threads REQUIRES: A 3mm hex wrench Thread locking compound GPMR6060 SPECS: Width between mounting hole centers: 42mm COMMENTS: Other muffler extensions use: OSMG2582 15mm OSMG2586 35mm JAL 5/12/98up ir/jl updated tjt 042605