Replacement Kirby tank cap / measuring cup for Rug shampoo system tanks that fit Kirby vacuums made BEFORE 1990. 
Cap fits Shampoo tanks from Kirby vacuum models: 
- Legend II 
- Legend 
- Heritage II 
- Kirby model 2HD (2-HD) 
- Heritage 
- Heritage 84 
- Kirby model 1HD (1-HD) 
- Kirby model 1HC (1-HC) 
- Tradition (3-CB, 3CB) 
- Classic Omega (1-CB, 1CB) 
- Classic III (Classic 3, 2-CB, 2CB) 
- Classic (1-CR, 1CR) 
- Sanitronic D50 
- Sanitronic D80 
- Sanitronic VII (516) 
Kirby replacement part 308984 and 308984S.