Abstract: A removable lid for a pool skimmer, the lid including at least one, and preferably two, manually operated latches that prevent inadvertent removal of the lid and thereby eliminate a potentially hazardous condition posed by lids that can be removed by wind action, wave action, or by accidentally tripping on an incorrectly installed lid. Preferably, the lid has diametrically opposed latches, each having a bendable member with a camming surface that bends the latch to fit within a skimmer collar and then allows the latch to snap into a retaining position when the lid is completely installed. Access holes in the lid facilitate manual operation of the latches for removal of the lid for maintenance purposes.

Abstract: A manually operable pressure relief valve for swimming pool filter systems and the like, including a valve housing, a valve stem movable axially in the housing to open and close the valve, and a top cover that serves as an operating handle. The valve housing and the valve stem have components that cooperate to provide an axial movement from closed to fully open with only a quarter turn of the stem, and to prevent inadvertent removal of the stem from the housing. The stem must be moved deliberately through a sequence of required rotational and axial displacements to remove it. The top cover must also be manipulated in a prescribed manner to effect removal of the stem from the housing.