Related Clues:
- Union for plumbers
- Crooked joint
- Em preceder
- PVC piping shape
- Wing of a mansion, sometimes
- Distance fellow travellers cover repeatedly
- Extension to a main building
- Addition shape, sometimes
- Himalayan center
- Building build-on
- Letterhead?
- Edifice addition
- 90-degree joint
- First in line?
- An addition that extends a main building