O'Ring bleed screws are designed to prevent fluid leakage during bleeding in conjunction with a specially designed bleed screw port. Now standard fitment on all recent AP Racing caliper designs. AP Racing offer two bleed screws and two o-rings in a kit, see options below:

CP3880-1 - Metric

• 2x M10 x 10 Bleed Screws - CP4970-125
• 2x Ø8-10x1.60 O-Ring Seal - CP4970-124

CP3880-2 - UNF

• 2x 3/8" x 24 UNF Bleed Screws - CP5820-123
• 2x Ø7-10 x 1.60 O-Ring Seal - CP6297-111