Weld nipples with O-ring seal
Tube fittings
Weld nipples with an O-ring seal form a permanent port end on a tube: the nipple is welded to the pipe run or to the component, while the separable joint itself seals on an O-ring rather than on a metal cutting edge. This category holds 67 items.
Outside diameter together with wall thickness govern the choice. The range runs from 12 x 1.5 mm up to 42 x 3 mm, wall thickness reaching 6 mm, as on 38 x 6 mm. Two materials are offered: stainless steel 1.4571 or phosphated steel.
Weld nipples are used where pipework is tied permanently to a power unit, a tank, or a further line, so that cutting ring technique drops out. Small sizes from 12 x 1.5 mm serve branch lines, large bores up to 42 x 3 mm serve collector plus return lines. The 1.4571 version suits stainless pipework, phosphated steel suits plain carbon circuits.
