A bracket for coupling three or more frame members to one another, the bracket comprising: a structural portion comprising at least one first material; a sealing portion comprising at least one second material different than the at least one first material; wherein the at least one first material is relatively more rigid than the at least one second material; a first receiver defining a first longitudinal axis and configured to receive an end of a first frame member, the first receiver comprising: a first retainer portion configured to be coupled to the end of the first frame member; and a first sealing interface configured to provide a substantially dirt- and fluid-resistant seal between a portion of the end of the first frame member and the first receiver; a second receiver defining a second longitudinal axis substantially parallel to the first longitudinal axis of the first receiver and configured to receive an end of a second frame member, the second receiver comprising: a second retainer portion configured to be coupled to the end of the second frame member; and a second sealing interface configured to provide a substantially dirt- and fluid-resistant seal between a portion of the end of the second frame member and the second receiver; and a third receiver defining a third longitudinal axis substantially perpendicular to at least one of the first longitudinal axis of the first receiver or the second longitudinal axis of the second receiver, and configured to receive an end of a third frame member, the third receiver comprising: a third retainer portion configured to be coupled to the end of the third frame member; and a third sealing interface configured to provide a substantially dirt- and fluid-resistant seal between a portion of the end of the third frame member and the third receiver, wherein the structural portion comprises the first retainer portion, the second retainer portion, and the third retainer portion, wherein the sealing portion comprises the first sealing interface, the second sealing interface, and the third sealing interface; and characterised in that the first sealing interface comprises opposing fluid barriers (216, 218) extending in a direction substantially parallel to the first longitudinal axis of the first receiver and defining a pocket configured to receive therein an edge portion of the end of the first frame member. a structural portion comprising at least one first material; a sealing portion comprising at least one second material different than the at least one first material; wherein the at least one first material is relatively more rigid than the at least one second material; a first receiver defining a first longitudinal axis and configured to receive an end of a first frame member, the first receiver comprising: a first retainer portion configured to be coupled to the end of the first frame member; and a first sealing interface configured to provide a substantially dirt- and fluid-resistant seal between a portion of the end of the first frame member and the first receiver; a first retainer portion configured to be coupled to the end of the first frame member; and a first sealing interface configured to provide a substantially dirt- and fluid-resistant seal between a portion of the end of the first frame member and the first receiver; a second receiver defining a second longitudinal axis substantially parallel to the first longitudinal axis of the first receiver and configured to receive an end of a second frame member, the second receiver comprising: a second retainer portion configured to be coupled to the end of the second frame member; and a second sealing interface configured to provide a substantially dirt- and fluid-resistant seal between a portion of the end of the second frame member and the second receiver; and a second retainer portion configured to be coupled to the end of the second frame member; and a second sealing interface configured to provide a substantially dirt- and fluid-resistant seal between a portion of the end of the second frame member and the second receiver; and a third receiver defining a third longitudinal axis substantially perpendicular to at least one of the first longitudinal axis of the first receiver or the second longitudinal axis of the second receiver, and configured to receive an end of a third frame member, the third receiver comprising: a third retainer portion configured to be coupled to the end of the third frame member; and a third sealing interface configured to provide a substantially dirt- and fluid-resistant seal between a portion of the end of the third frame member and the third receiver, a third retainer portion configured to be coupled to the end of the third frame member; and a third sealing interface configured to provide a substantially dirt- and fluid-resistant seal between a portion of the end of the third frame member and the third receiver, wherein the structural portion comprises the first retainer portion, the second retainer portion, and the third retainer portion, wherein the sealing portion comprises the first sealing interface, the second sealing interface, and the third sealing interface; and characterised in that the first sealing interface comprises opposing fluid barriers (216, 218) extending in a direction substantially parallel to the first longitudinal axis of the first receiver and defining a pocket configured to receive therein an edge portion of the end of the first frame member.