Home / Pipes and Fittings / BUTELINE / BUTELINE PB-1 Reducing Straight Inline Coupling BUTELINE PB-1 Reducing Straight Inline Coupling Size Choose an option22X18mm SR12322X18mm SR123Clear Related products BUTELINE PB-1 Equal Tee BUTELINE PE Reducing Tee BUTELINE PB-1 Equal Elbow BUTELINE PB-1 Female Swivel Elbow BUTELINE PB-1 Lugged Elbow BUTELINE PE Pipe End Plug