The BESWICK ENGINEERING elbow fittings of the M5LS series, with M5 x 0.8 external thread and built-in barb, have adjustable positioning, and can operate on pressures up to 100 psig, when used with polyurethane tubing. The limiting factor becomes the burst pressure, thanks to the pre-installed clamp. They feature Beswick's O-ring seal design, guaranteeing no-leakage, and a single edged "line contact" barb, that enables a manual connection to the tube, while preserving stiffness and holding power. They are mostly used for polyurethane or vinyl tubing. Specific tubing materials can be specified, for different custom-made fittings. The brass stud of these fittings does not contain a screwdriver slot.