A multiple pet leash includes an elongated handle portion having a loop at one end and a swivel at another end, which engages at least two pet tethers. In one embodiment, an ultrasonic flow metering system includes a passage for fluid flow, an ultrasonic flow meter, and a condition monitor. In some implementations, cycling the flash memory includes erasing and writing to the flash memory in specific patterns in order to dissipate charge that may have accumulated during a fabrication process. At least one strap is provided to attach the mount to the seat base frame in a direction transverse that of the overlapping holster mounting straps. The storage system includes a controller, connected with the adapters, for collecting performance information indicating performance of each of the adapters, comparing the collected performance information of the adapters with each other, and detecting a suspected adapter that is suspected of having a performance failure on the basis of a result of the comparison. As a result, the mold cavity is filled with molten thermoplastic material by advancing a continuous flow front of thermoplastic material from a gate to an end of the mold cavity.