Aspects of the present disclosure relate to retainer nut locking apparatus and methods for fluid ends, and associated components thereof. In one implementation, a method of operating a fluid end includes installing a retainer nut assembly on a fluid end body by turning a retainer nut in an installation direction and into a bore formed in the fluid end body. The retainer nut has a first surface that faces away from the fluid end body and a second surface that faces that fluid end body. The method also includes rotating a locking tab in a locking direction and into contact with an inner surface of the fluid end body. The locking direction is opposite of the installation direction. The locking tab is disposed inside the bore and adjacent to the second surface of the retainer nut.

Example aspects of a nozzle cap adapter, a nozzle cap assembly, and a method for method for mounting a nozzle cap to a fire hydrant nozzle are disclosed. The nozzle cap adapter can comprise an adapter ring defining a first adapter ring end, a second adapter ring end opposite the first adapter ring end, and an interior void extending from the first adapter ring end to the second adapter ring end; a nozzle connector extending from the second end of the adapter ring, the nozzle connector configured to rotatably engage a fire hydrant nozzle; and a latch coupled to the adapter ring and configured to removably lock the nozzle cap adapter onto the fire hydrant nozzle.

A protector is proposed for an end of an elongate member, such as an end of a pipe or tube. The protector comprises a rigid portion which has a body portion for insertion into a cavity defined by an end portion of the elongate member, and a cover portion extending from the body portion. The protector further comprises a flexible portion provided on an outer surface of the body portion. The flexible portion comprises one or more resilient members. When the body portion is received within the cavity of the elongate member, the resilient members engage the inner surface of the cavity, and the cover portion covers an end surface of the elongate member.

A nozzle cap spacer for a hydrant nozzle cap includes a spacer body defining an outer edge and an inner edge, the inner edge defining an opening formed through a center of the spacer body; and a leak path notch formed in the spacer body, the leak path notch extending radially inward from the outer edge of the spacer body.

A nozzle cap spacer for a hydrant nozzle cap includes a spacer body defining an outer body edge, the spacer body defining a spacer body thickness; and a resilient first spacer spring arm extending from the outer body edge and biased away from the spacer body in an extended orientation, wherein the first spacer spring arm defines a first spring arm thickness; wherein the first spring arm thickness of the first spacer spring arm is equal to the spacer body thickness of the spacer body.

A housing element for food applications having a casing made of metallic material and a cover made of composite material and having a bottom surface which is closed or provided with a through-hole. The housing element is provided with a system for securing the cover on the casing, comprising at least two steps which are formed on the cover and which engage with interference inside at least two corresponding grooves formed on the casing.

A housing element for food applications having a casing made of metallic material and a cover made of composite material and having a bottom surface which is closed or provided with a through-hole. The housing element is provided with a system for securing the cover on the casing, comprising at least two steps which are formed on the cover and which engage with interference inside at least two corresponding grooves formed on the casing.

A housing element for food applications having a casing made of metallic material and a cover made of composite material and having a bottom surface which is closed or provided with a through-hole. The housing element is provided with a system for securing the cover on the casing, comprising at least two steps which are formed on the cover and which engage with interference inside at least two corresponding grooves formed on the casing.

Example aspects of a nozzle cap for a fire hydrant and a method of detecting a leak in a fluid system are disclosed. The nozzle cap for a fire hydrant can include an outer housing defining a first end, a second end opposite the first end, and a substantially circumferential wall extending from the first end to the second end; an antenna coupled to the substantially circumferential wall of the outer housing; a cap cover coupled to the outer housing at the first end; and an inner housing coupled to the outer housing at the second end.

A one-piece Storz-type fluid coupling and coupling system are disclosed that provide additional strength and a cleanout port that externally ejects debris away from the coupling. The one-piece Storz-type fluid coupling can include a flange portion including a circumferentially and radially extending base wall, an annular hub extending axially away from a radially inward portion of the base wall and having an annular axially-facing sealing surface, a pair of diametrically opposite lugs projecting axially away from the base wall, an outer wall extending circumferentially and axially outwardly from the base wall, coupling flanges extending circumferentially and radially inwardly from the outer wall and having lug retention lips, lug entry/exit pockets located between the lugs and the lug retention lips, lug retention channels located between the lug entry/exit pockets and the lugs, and cleanout ports located circumferentially between the lugs and lug retention pockets.