Many new style master cylinders have female bubble flared ports. I am sure there are also many other applications for this adapter as well. (bubble flare to inverted flare). M12-1.0 Male BF(bubble flare) to Female M10-1.0 IF(inverted flare).
Master Cylinder Bubble Flare M12-1.0 x F10-1.0 Inverted Brake Adapter Fittings-2
3/16" Female(10mmx1) Bubble Flare to Male(12mmx1)Bubble Flare Brake Line Adaptor
3/16" Metric Tube adaptor 3/8-24 inverted flare(F) to 12mm x 1.0 bubble flare(M)
SALE Male 3/8-24 Bubble Flare x 3/8-24 Female SAE Inverted Flare Brake Adapter
3/16" Metric Tube adapter 3/8-24 inverted flare (F) to 11 x1.5 Bubble flare (M)
2 Steel Brake Adapter Fittings M12 x 1.0 (Metric 12mm) to 4AN -4 Bubble Flare
