T-piece Ø 38 mm (for PVC FLEXTRACT Ø 38 mm with thread), Y-piece Ø 38 mm (for PVC FLEXTRACT Ø 38 mm with thread), T-piece Ø 50 mm (for PVC FLEXTRACT Ø 50 mm with thread), Y-piece Ø 50 mm (for PVC FLEXTRACT Ø 50 mm with thread), Y-piece Ø 50 mm (without thread for all tubes of Ø 50 mm), T-piece Ø 50 mm (without thread for all tubes of Ø 50 mm).