I just bought a new one for my 2nd tank, which I've just installed.
More on that later....

Marshall 290 = $21.95; plastic covers = $2.95 at the
RV store in Boulder.

They said the square design fails where the round one doesn't
because of the corner stress on the rubber diaphrams.

                                            Richard A.. Jones
                                            Boulder, Colorado
                                            '81 Vanagon  Mr Bus
                                            '87 Syncro Westy  El Jefe