2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/58375We discuss discuss spectral and scattering properties of a particle confined to a straight Dirichlet tube in $\mathbb{R}^3$ with a family of point interactions.AMSTeX, 10 pages, written for the jubilee volume dedicated to the 60th birthday of Sergio AlbeverioMathematical Physicstext