Joint for variable wall thickness conduit

A joint formed between two sections of conduit, said joint comprising:

• a. a first joint member comprising:
• i. a first wall having a first outer surface and a first inner surface, a variable thickness being defined therebetween;
• ii. a first support surface formed adjacent said first outer surface, said first support surface having a constant width;
• iii. a sealing leg formed adjacent said first inner surface;
• and
• b. a second joint member joined to said first joint member, said second joint member comprising:
• i. a second wall having a second outer surface and a second inner surface, a variable thickness being defined therebetween;
• ii. a second support surface being formed adjacent said second outer surface, said second support surface having a constant width that is less than the width of said first support surface, said second support surface being in force-transmitting relationship with said first support surface;
• iii. a recess formed adjacent said second inner wall, said recess having a sealing wall, a constant-width gap being formed between said sealing wall and said sealing leg;
• and
• c. a sealing member retained within said constant-width gap, said sealing member contacting said sealing wall and said sealing leg.

A conduit section having an outer wall, a first end and a second end, said wall having an inner surface and an outer surface, a variable thickness being defined therebetween, said conduit section comprising:

• a first joint member formed at said first end, said first joint member comprising:
• i. a first support surface formed adjacent said inner surface, said first support surface having a constant width;
• and
• ii. a sealing leg formed adjacent said outer surface;
• and
• b. a second joint member formed at said second end, said second joint member comprising:
• i. a second support surface formed adjacent said inner surface, said second support surface having a constant width that is less than the width of said first support surface;
• and
• ii. a recess formed adjacent said outer surface;
• whereby said first joint member aligns and joins to the second joint member of a second conduit section and said second joint member aligns and joins with the first joint member of a third conduit section.