Bottom lip outer diameter is 8-1/4″
Exploded parts diagram: This part is shown as item #2 on the Sand Filter, Waterco/Baker Hydro, HRV Series (Prior to 1984) exploded parts diagram.
🔧 Sand Filter, Waterco/Baker Hydro, HRV Series (Prior to 1984) – exploded parts diagram

The numbered parts below make up this assembly. Parts we stock are linked – click any to view.
| No. | Part |
|---|---|
| 26 | 30-252-W001K26 |
| 25 | 30-252-W001K25 |
| 24 | Bulkhead Adapter, Waterco Baker Hydro HRV/Vertilever |
| 23 | 30-252-W001K23 |
| 22 | Bulkhead Nut, Waterco Baker Hydro HRV |
| 21 | 30-252-W001K21 |
| 20 | Bulkhead Fitting, Waterco Baker Hydro HRV, Keyed |
| 19 | 30-252-W001K19 |
| 18 | 30-252-W001K18 |
| 17 | Drain Cap, Waterco Baker Hydro HRV |
| 16 | 30-252-W001K16 |
| 15 | 31-252-1034 |
| 14 | 30-252-W001K14 |
| 13 | 30-252-W001K13 |
| 12 | 30-252-W001K12 |
| 11 | 30-252-W001K11 |
| 10 | Diffuser, Waterco Baker Hydro HRV |
| 9 | 30-252-W001K9 |
| 8 | Air Relief Screen, Waterco/Baker Hydro HRV/Micron, with Plug |
| 7 | 17-252-1045 |
| 6 | Washer, Waterco Baker Hydro Ultra Mite/HRV, 5/16",Clamp Ring |
| 5 | 30-252-W001K5 |
| 4 | Clamp Half, Waterco Baker Hydro Ultra Mite/HRV |
| 3 | Clamp Ring Assembly, Waterco UltraMite/HydroMite |
| 2 | Tank Lid, Waterco Baker Hydro, HRV Prior 1984, Twist Lock ◀ this part |
| 1 | 30-252-W001K1 |




