An underwater mask includes a frame, a transparent portion supported by the frame, a seal portion mounted on the frame and adapted to be positioned on a user's face, and a ventilation tube. The seal portion has a partition wall resting on the user's nose and forming upper and lower chambers, which communicate through a passage in the partition wall and a one-way valve to enable air to flow only from the upper to the lower chamber. The ventilation tube has separate channels providing communication between the upper and respectively the lower chamber and the outer environment, and a hub between tube and mask, fastened to the mask and connected to the tube by a joint, so that in a coupling position the hub and the tube are fastened, and in a releasing position the hub and the tube remain connected but the tube is free to swing.

Diaphragm valve or non-return valve in combination with a supporting wall (3) for said diaphragm valve, which supporting wall is made of flexible and elastically deformable material such as rubber, silicone, or the like, and wherein said valve comprises: a diaphragm plug (130) of elastic, flexible material; a valve seat (50) with at least one passage opening surrounded by a continuous surface closed on itself, for sealing adhesion contact of at least one corresponding sealing lip of the diaphragm plug. According to the invention the diaphragm plug (130) is made in one piece and of the same material as the supporting wall (3), it being separated along its perimetrical edge from said supporting wall by slots (230) delimiting said perimetrical edge and that have a predetermined length, while said diaphragm plug (130) is connected to said supporting wall (3) by at least two material bridges (330) that are provided on opposite sides of the perimetrical edge of said diaphragm plug (130); the valve seat (50) being provided in the form of a shaped plate and being locked to the supporting wall (3) in a position coincident with the diaphragm plug (130) by a tightening annular element (40), the valve seat (50) being provided on one side of the supporting wall (3) and the tightening ring (40) on the opposite side of the supporting wall and the valve seat and/or the tightening ring having mutual engagement means (140, 240) passing through at least part of said slots (330).

An underwater mask includes a frame, a transparent part, a seal part mounted on the frame, and a snorkel. The seal part has a partition wall forming an upper and a lower chamber, the lower chamber receiving nose and mouth of the user. The two chambers communicate through a passage in the partition wall and a one-way valve so that air can pass only from the upper chamber to the lower chamber. The snorkel has first and second channels through which the upper and respectively lower chamber communicate with the outside. A connection end between snorkel and mask is fastened at an opening of the seal part to put the first channel of the snorkel in communication with the upper chamber of the mask, and further has a side inlet for a corresponding exhaust tube that puts the lower chamber in communication with the second channel of the snorkel.

A full face mask and snorkel can include a full face mask and a rigid snorkel attached to the side of the mask. The side location of the ridged snorkel avoids peripheral ducting of air around the full face mask. The full face mask includes a main peripheral full face seal coupled to the mask's rigid support structure. The full face mask includes a separation seal dividing the full face mask into at least an upper chamber. The snorkel is affixed to the side of the full face mask at a location proximate to where the separation seal meets the main seal. A full face mask and snorkel can also include an exhalation valve located within the snorkel and proximate to the mask so as to avoid a volume of respirated air within the snorkel from being reinhaled into the lower chamber of the full face mask.

A mask for underwater use includes a frame, a transparent part supported by the frame, and a gasket part mounted on the frame and configured to be positioned on the face of a user. The gasket part has a perimeter edge adapted to rest on the perimeter of the user's face, and the perimeter edge includes a discharge opening, which is located at the region configured to be arranged near the user's mouth and which is the seat of a valve non-return mechanism, which enables the expulsion of breathed gases simultaneously with any water present in the lower chamber through the opening.

A diving mask system is disclosed comprising a faceplate having a lateral partition on an interior surface delineating an upper and lower section, the lower section comprising a region that extends away from the upper section and includes at least one cutout section fitted with a complementary-shaped flexible insert that enables a user to grasp the nose. The faceplate further includes a flexible tubular insert defining a passageway extending through the faceplate to a lower chamber. The tubular insert has a distal end dimensioned to fit and seal onto the mouthpiece receiver tube of a conventional second stage scuba regulator permitting the mask to be scuba enabled. A quick-release clasp mechanism attached to the mask's elastic retention straps is also disclosed.

A snorkel and diving mask is disclosed comprising a faceplate having a lateral partition on an interior surface delineating an upper and lower section, the lower section comprising a region that extends away from the upper section and includes a cutout section fitted with a complementary-shaped flexible insert that enables a user to grasp the nose. The faceplate further includes a snorkel coupling having a passageway contained therein. The snorkel and diving mask further includes a tubular interface sleeve which fluidly connects the snorkel coupling passageway to a mouthpiece receiver tube of a conventional second stage scuba regulator.

A snorkel mask is disclosed comprising a faceplate having a lateral partition on an interior surface delineating an upper and lower section, the lower section comprising a region that extends away from the upper section and includes a cutout section fitted with a complementary-shaped flexible insert that enables a user to grasp the nose. The snorkel mask further includes a rigid frame bonded to the faceplate and sandwiched between the faceplate and a flexible annular sidewall skirt that is hollow and filled with a gas or other cushioning substance. The flexible skirt includes a lateral nose piece section attached to the partition. The lateral nose piece section having an inlet aperture and check valve for inhaled air, and an orifice through which an exhalation conduit extends from the lower chamber to a snorkel device forming a passageway for exhaled air to pass through the upper chamber to the snorkel device.

A breathable mask is provided, which includes a body and a breathing tube in fluid communication with an interior thereof. The body includes a main frame, a lens, a waterproof skirt, a multi-channel connector, and intake and exhaust passages. The waterproof skirt has a partition dividing the interior of the body into upper and lower chambers, thereby accommodating the user's eyes and nose in the upper and lower chambers, respectively. The multi-channel connector has an upper end in fluid communication with the lower chamber. The intake passage is formed between the lower end portion of the breathing tube and the lower chamber. The exhaust passage is arranged upward along a periphery of the body to allow dirty air exhaled from the user to unidirectionally flow outward through the exhaust passage. The exhaust passage includes an exhaust tube with a bottom portion coupled to and communicating with the multi-channel connector.

A snorkeling tube structure with a tube body and a partition portion is provided. The tube body is formed along an axis and has an outer surface and an inner surface which encircles the axis to define an air passage; the axis includes a curved section. The partition portion is formed integrally with the tube body along the axis, and disposed on the inner surface of tube body to divide the air passage into an intake passage and an outtake passage. A method of manufacturing a snorkeling tube structure is also provided, including the following steps: forming a parison including a first passage and a second passage; placing the parison in a mold cavity; injecting air into the first and second passages to inflate the parison towards a wall of the mold cavity; and removing the inflated parison from the mold to get a snorkeling tube structure.