| hold 4 gallons | 0.43 |
| reduce attic heat | 0.25 |
| flammable propane | 0.45 |
| lockable gas cap | 0.25 |
| vented free of vapor | 0.60 |
| designed | 0.59 |
| mounted | 0.54 |
| sold on the market | 0.44 |
| allowed | 0.40 |
| constructed in safe, cr… | 0.40 |
| removed | 0.36 |
| filled | 0.31 |
| taped shut | 0.25 |