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 |
🔧 Exploded diagram and parts
This part belongs to the Cartridge Filter, Pentair PacFab, Sea Horse, FSH FG Tank assembly. Everything listed below is something we stock for it, and the numbers match the diagram.
Complete tools
| Part | Our part number | Availability | |
|---|---|---|---|
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Tool, Button-Hook, Drain Plug Wrench, Stainless Steel | DPW-150 | 23 in stock |
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Tool, Socket, Double-Hex, 9/16 and 7/8, with 1.48well | MT-100 | 11 in stock |


































