A pump assembly for a fluid tank extends along a longitudinal axis and includes a cover at an external end, the cover including a flange that extends radially outward of the longitudinal axis, an insertable end opposite the external end along the longitudinal axis, and a rotatable arm that is flexible such that, when the rotatable arm is resiliently bent such that the rotatable arm has a radial extent, from the longitudinal axis, that is less than the flange, the sender assembly is in a compact state in which the insertable end and the flange would be able to move straight along the longitudinal axis, which is coaxial with a center axis of an opening of the fluid tank, from a position where the insertable end initially enters the opening to a position where the flange engages the fluid tank.

A pump assembly for a fluid tank extends along a longitudinal axis and includes a cover at an external end, the cover including a flange that extends radially outward of the longitudinal axis, an insertable end opposite the external end along the longitudinal axis, and a rotatable arm that is flexible such that, when the rotatable arm is resiliently bent such that the rotatable arm has a radial extent, from the longitudinal axis, that is less than the flange, the sender assembly is in a compact state in which the insertable end and the flange would be able to move straight along the longitudinal axis, which is coaxial with a center axis of an opening of the fluid tank, from a position where the insertable end initially enters the opening to a position where the flange engages the fluid tank.

A submersible fluid pump suitable for use in a landfill well includes an outer case extending along a vertical axis and at least partially defining an interior of the fluid pump, a fluid inlet and outlet, a discharge tube within the outer case and disposed between the fluid inlet and the fluid outlet, a float positioned around the discharge tube and within the outer case such that the float is within the discharge tube and the outer case, the float being movable along the discharge tube in an axial direction, a pneumatic valve configured to introduce pressurized air into the interior of the fluid pump, an actuator configured to open and close the pneumatic valve, and a plurality of magnets comprising a first magnet fixed with respect to the actuator and a second magnet fixed with respect to the float, the second magnet configured to magnetically repel the first magnet as the float moves to tip the actuator to either open or close the pneumatic valve.

A mobile power supply device and method for energizing a sump pump in a sump pit during a power outage, and a mobile power supply device and method for energizing a sump pump secured to a bottom portion of the device. The device includes an enclosure similar to a dolly that is manufactured from plastic or similar non-electrically conductive material to minimize weight to enable the manual lifting and pulling of the mobile power supply device, and to promote safety by reducing the chance of an electrical short circuit when supplying electrical power to a sump pump. The enclosure includes a carrying handle and a relatively large dolly handle that cooperate with castors attached to a bottom portion or bottom surface of the enclosure. The castors promote manual movement of the device upon a substantially horizontal surface or up and/or down stairs leading to a sump pump in a sump pump well or pit in a basement.

A mobile power supply device and method for energizing a sump pump in a sump pit during a power outage, and a mobile power supply device and method for energizing a sump pump secured to a bottom portion of the device. The device includes an enclosure similar to a dolly that is manufactured from plastic or similar non-electrically conductive material to minimize weight to enable the manual lifting and pulling of the mobile power supply device, and to promote safety by reducing the chance of an electrical short circuit when supplying electrical power to a sump pump. The enclosure includes a carrying handle and a relatively large dolly handle that cooperate with castors attached to a bottom portion or bottom surface of the enclosure. The castors promote manual movement of the device upon a substantially horizontal surface or up and/or down stairs leading to a sump pump in a sump pump well or pit in a basement.

A fluid sensing switch comprising a flex sensor having a plurality of conductive sensing areas and an energizing conductive area and a synchronous detector that detects a presence and a content of a bilge and produces a signal that is used to activate a pump.

A fluid sensing switch comprising a flex sensor having a plurality of conductive sensing areas and an energizing conductive area and a synchronous detector that detects a presence and a content of a bilge and produces a signal that is used to activate a pump.

An additive pump is configured to collect migrant additive that penetrates into its reciprocating shaft. These configurations may include a pump head, an actuator that penetrates into the pump head, a sealed region disposed about the actuator to form a fluid-free zone, and a fluid sensing unit coupled with the sealed region, the fluid sensing unit comprising a receptacle that is configured to retain fluid that transits from inside the sealed region.

An additive pump is configured to collect migrant additive that penetrates into its reciprocating shaft. These configurations may include a pump head, an actuator that penetrates into the pump head, a sealed region disposed about the actuator to form a fluid-free zone, and a fluid sensing unit coupled with the sealed region, the fluid sensing unit comprising a receptacle that is configured to retain fluid that transits from inside the sealed region.

A sender assembly that has a compact state, which may allow a pump assembly including the sender assembly to be easily inserted into an opening of a fluid tank. For example, the pump assembly may be insertable into the opening of the fluid tank while a longitudinal axis of the pump assembly remains coaxial with the opening. When in the compact state a rotatable arm and a float of the sender assembly may be entirely within or deformable to be within a predetermined envelope that has a radial extent less than the opening of the fluid tank to allow the sender assembly to be inserted straight into the opening. The predetermined envelope may be coaxial with the longitudinal axis and have a cross-section transverse to the longitudinal axis that matches the opening of the tank.