an advantage for the do it yourself mechanic the means for pivotally connecting the overlapping ends 50 of the two pipe clamps comprise the shank portion of a bolt 60 having a head at one end overlying one of the end portions 50 and a nut not shown threaded onto the shank and overlying the end portion of the other clamp such that upon tightening the nut the overlapping end portions 50 may be drawn tightly together to lock the pipe clamps in an adjusted angular position to consequently hold the pipes 28 and 30 in adjusted angular positions the construction and arrangement of the pipe clamps forming the connector 32 is such that the pipes held by the clamps may abut one another as shown in fig2 and 3 in fig2 an upright pipe 62 bears at its upper end 64 against another pipe 66 forming a portion of the roof of the frame whereby the loading on the roof member 66 is transmitted directly to the pipe 62 the lower end of pipe 62 may be provided with a rubber cap 68 to prevent damage to the deck of the boat in fig3 where the connector is used at an outside corner the ends of the pipes may be arranged to slightly nestle or interfit as at 70 whereby loading from the roof member 30 may be transmitted directly to the upright 28 it is apparent from a consideration of fig2 and 3 that the loading may be transmitted directly between the pipes received in the connector at substantially any angle of inclination between the.