The present invention relates to improvements in swimming pools or other impoundments (hereinafter, “swimming pools”), for use in patios, gardens, open spaces, and around homes, which have an upper frame that supports a membrane which contains the contents of the pool, which upper frame is connected to support legs. The bottom of the pool has extensions or strips which are bent into a loop to engage a crossbar or other engaging member at the foot of each said leg and one of the lateral walls of the pool contains an annular laminar insert which extends radially from a tubular projecting member which has a double wall which defines a space in which a lateral wall of a plug is compressively engaged, which plug is connected via a laminar strip to the annular laminar insert, wherewith said plug also has a double wall which defines an annular recess, and wherewith the internal surface of the said cylindrical space or said cylindrical recess bears a ridge which extends around the entire circumferential extent of said surface. The strips may have a variety of configurations.
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