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Oil filter. Fits Zongshen Z155. Paper filter
Hole in end 13.5mm (double-check your stub)
Option 1 = 3 Psi bypass valve 10/40 oil (yellow)
Option 2 = 6 Psi bypass valve 20/50 oil (red)
Length 40mm
O/D 43mm
Hole in end 13.5mm Price for 1