A snap-on fillerneck for a tank (52) on a heat exchanger includes a hollow body (10) having an interior sealing surface intermediate its ends (12,14) which is adapted to be engaged by a seal (22) on a pressure cap (24) and which faces axially toward one end (12) of the body (10). An exterior flange is located on the end (12) of the body (10) and has pressure cap retaining surfaces for retaining the pressure cap (24) thereon. Resilient fingers (36) extend from the other end (14) of the body (10) and have integral generally radially movable retaining surfaces (38) for retaining abutment with an end (58), in a mounting element (50). The body (10) includes an exterior sealing surface (44) intermediate the ends (12,14) thereof for cooperation with a seal (46) to seal the interface of the body (10) and the mounting element (50).
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