Part family guide
Pfister 0X8/JX8 Valve Cartridge Generations
Pfister separates legacy deep- and shallow-casting valve service parts, while its current 974-5299 listing documents backward compatibility with legacy 0X8 and JX8 cartridges.
Direct answer
Pfister identifies 974-042 for deep-casting 0X8/JX8/VB8/JV8 valves and 974-321 with an adapter for shallow-casting versions; both pages mark those parts discontinued and replaced by 974-5299. Confirm the valve body, casting depth, and any required adapter before following that documented service direction.
Fit facts
What identifies this match
Use these details together. One matching feature does not establish compatibility.
- Legacy deep-casting part
- 974-0420
- Legacy shallow-casting part
- 974-3210 with adapter
- Current listed replacement
- 974-5299
- Valve families named by Pfister
- 0X8, JX8, VB8, and JV8
- Current compatibility statement
- 974-5299 is listed as backward compatible with legacy 0X8/JX8 cartridges
- Required confirmation
- Valve body, casting depth, cartridge geometry, and extension needs
Deep- and shallow-casting records
Pfister's legacy 974-0420 page names a cartridge for 0X8, JX8, VB8, and JV8 deep-casting valves. The 974-3210 page names a cartridge with an adapter for shallow-casting versions of those valve families.
Those application statements are more precise than a general PermaBalance label. Preserve the complete valve and part identifiers rather than treating every Pfister pressure-balance cartridge as one family.
Documented replacement direction
Both legacy product pages state that the parts are discontinued and replaced by 974-5299. The current 974-5299 page describes an 0X8 cartridge, names VB8 and JV8 bodies, and states backward compatibility with legacy 0X8/JX8 cartridges.
A documented supersession can still change the supplied cartridge, limit stop, or extension arrangement. Read the current specification sheet and compare the package contents before disassembly.
Identify the installed valve
Use original paperwork, the rough-in model, casting details, and the removed cartridge to determine whether the installation follows a deep- or shallow-casting service path. Trim styling and the Pfister logo do not reveal that distinction by themselves.
Photograph the installed orientation, measure the relevant depth from a defined surface, and retain every adapter, stop, and fastener for comparison.
Stop at a conflicting interface
Do not force a replacement when the adapter, keys, seals, stop, or body depth differs from the official service information. A conflicting interface means the valve generation or required conversion parts need to be rechecked with Pfister support.
Questions
Before you remove or replace the part
What replaced Pfister 974-042 and 974-321?
Pfister's product pages mark both legacy parts discontinued and link to 974-5299 as the replacement.
Does 974-5299 cover legacy 0X8 and JX8 cartridges?
Pfister's current listing states backward compatibility with legacy 0X8/JX8 cartridges. Confirm the exact valve body and required accessories.
Why does casting depth matter?
Pfister's legacy records distinguish deep-casting 974-042 from shallow-casting 974-321 with an adapter, so depth and installed hardware help establish the service path.
Reference trail