Exploded parts diagrams: This part is shown as item #33 on the Cartridge Filter, Pentair PacFab, Sea Horse, FSH FG Tank; item #28 on the DE Filter, Pentair/PacFab, FNS Polymeric FNS24,36,48,60; item #18 on the DE Filter, Pentair, Quad 60, 80 & 100 exploded parts diagrams.
🔧 Cartridge Filter, Pentair PacFab, Sea Horse, FSH FG Tank – exploded parts diagram

The numbered parts below make up this assembly. Parts we stock are linked – click any to view.
| No. | Part |
|---|---|
| – | Tool, Button-Hook, Drain Plug Wrench, Stainless Steel |
| – | Tool, Socket, Double-Hex, 9/16 and 7/8, with 1.48well |
| 45 | Manual Air Relief Valve, Pentair PacFab Purex, with Clamp |
| 44 | 16-110-W021K44 |
| 41 | 17-110-1599 |
| 39 | Top Spacer, Pentair PacFab |
| 38 | Spacer, Pentair PacFab NS/Sea Horse/FNS, blk |
| 35 | 16-110-W021K35 |
| 34 | 16-110-W021K34 |
| 33 | Washer, Pentair PacFab FSH/FNS/Quad, Large ID ◀ this part |
| 32 | 16-110-W021K32 |
| 31 | 16-110-W021K31 |
| 30 | Back Up Ring, Pentair PacFab FNS/FSH |
| 29 | 16-110-W021K29 |
| 28 | 16-110-W021K28 |
| 27 | Adapter, Pentair PacFab FSH/FNS, 6" |
| 26 | 16-110-W021K26 |
| 25 | Tank Base, Pentair PacFab FNS/FSH |
| 24 | Pipe Assembly, Pentair PacFab Sea Horse FSH/FNS |
| 23 | O-Ring, 5-3/4" ID, 1/8" Cross Section, Generic,O-108 |
| 22 | Cartridge Support, Pentair PacFab Sea Horse FSH, w/Bumpers |
| 21 | Adapter, Pentair PacFab, 2", 2 required |
| 20 | 16-110-W021K20 |
| 19 | O-Ring, 2-3/8" ID, 3/16" Cross Section, Generic |
| 18 | 16-110-W021K18 |
| 17 | O-Ring, Pent PacFab Sea Horse/FNS/Nautilus, Bulkhead, O-409 |
| 16 | External Spacer, Pentair PacFab NS/Sea Horse/FNS |
| 15 | 16-110-W021K15 |
| 14 | Clamp Ring, Pentair PacFab FNS/FSH, Tank Body |
| 13 | O-Ring, PentairPacFab Sea Horse/FNS, Tank Body, O-420 |
| 12 | 16-110-W021K12 |
| 11 | O-Ring, Buna-N, 2-3/16" ID, 3/32" CrossSection, Generic |
| 10 | Manifold, Pentair PacFab Sea Horse FSH |
| 9 | 16-110-W021K9 |
| 8 | Bleed Tube, Pentair PacFab Sea Horse FSH |
| 7 | Air Relief Strainer, Pentair PacFab |
| 6 | Rubber Bumper, Pentair PacFab Sea Horse FSH |
| 5 | O-Ring, 2-5/8" ID, 3/16" Cross Section, Generic |
| 4 | 16-110-W021K4 |
| 3 | 17-110-1581 |
| 2 | O-Ring, 5/16" ID, 3/32" Cross Section, Generic |
| 1 | 16-110-W021K1 |















