There are two current models of liquid to liquid separators for use with deadweight testers.
| Model | Part Num. | Description |
| P5521-70M | 4185715 | LIQUID TO LIQUID SEPARATOR, 70 MPA (10K PSI) |
| 10k psi (70 MPa) max, use with P5514 and P5515 for DUTs with different liquids | ||
| P5522-50M | 4185726 | LIQUID TO LIQUID SEPARATOR, 50 MPA (7000 PSI), SKYDROL USE |
| 7k psi (50 MPa) max, use with P5514 and P5515 for Skydrol DUTs other aggressive fluids |
The current model P5521-70M comes with a Viton diaphragm. Other o-rings are Viton or Buna-n. The manual shows an assembly diagram and list of parts including o-rings. The manual can be viewed or downloaded here,
https://us.flukecal.com/category/literature-type/product-manuals
It is often preferable to order an o-ring kit rather than individual o-rings. Here are the available o-ring kits:
3891185 P5521SK,SEAL KIT,P5521 (Rev 003)
The kit includes these parts.
| Part Number | Qty | Description |
| 3864891 | 1 | 54-700-139,O-RING BUNA N 2-3/16 X 3/32 XSEC 70 DURO |
| 3865163 | 1 | 54-703-008,O-RING, BLACK, VITON 3/16 X 1/16 X SEC |
| 3865277 | 1 | 54-703-12,O-RING VITON 3/8 X 1/16 XSEC |
| 3875813 | 1 | 5521SK-DS,SEAL KIT DATASHEET, 5521 SEPARATOR - VITON |
| 3865195 | 1 | 54-703-10,O-RING VITON 1/4 X 1/16 X SEC |
| 3919393 | 3 | P103614,O RING, VITON - 70 DUROMETER, 1/2 ID X 1/16 XS (SIZE 014) |
| 3919456 | 1 | P103629,VITON DIAPHRAGM - 5521 |
| 3922096 | 1 | P109740,BONDED SEAL[PP45-B]VITON BSP |
3891197 P5522SK,SEAL KIT,P5522 (Rev 002)
The kit includes these parts.
| Part Number | Qty | Description |
| 3867888 | 1 | P109701 O RING BS008 EP 70 DURO 3/16INID X 1/16 |
| 3867895 | 1 | P109703 O RING [BS010] 6.07X1.78 EP |
| 3921986 | 1 | P109705 O RING [BS012-75-EP] |
| 3921999 | 3 | P109706 O RING [BS014-EP] |
| 3922043 | 1 | P109716 SEAL BONDED PP45-B-SC-EP |
| 3864891 | 1 | 54-700-139 O-RING BUNA N 2-3/16 X 3/32 XSEC 70 DURO |
| 3919400 | 1 | P103620 EPDM DIAPHRAGM - 5522 |
| 4324411 | 1 | 5522SK-DS SEAL KIT DATASHEET 5522 SEPARATOR EP |