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The R002.23 Locking Knob from Manfrotto is a replacement part for various Manfrotto products. It locks leg sections on monopods, pan arms on fluid heads, and locks an umbrella adapter onto a light stand.
Compatible with the 026 swivel umbrella adapter, the 128LP, 128RC, and 128RCNAT fluid heads, and the 134 and 134SS monopods.