Keep your recovery pump running at peak performance with the TRS21 / BVV Upgraded Top Piston Assembly. Engineered for the serious extractor, this precision-built kit restores and upgrades your pump's top piston with a new piston seal and wear band — delivering tighter compression, longer service life, and more reliable solvent recovery session after session.
Why TRS21 / BVV Upgraded Top Piston Assembly
The BVV Upgraded Top Piston Assembly isn't just a replacement part — it's a performance upgrade. BVV's 2-piece stainless steel piston design outperforms the original CPS piston in durability and seal integrity, as shown in independent seal comparison testing. Whether you're rebuilding after heavy use or proactively maintaining your pump, this kit gives you the confidence that your equipment is operating to spec. Growers and extractors who've made the switch consistently report smoother pump operation and extended intervals between rebuilds.
Key Benefits
- Complete Rebuild Kit – Includes top piston assembly, piston seal, and piston wear band — everything needed for a full top-end rebuild.
- Upgraded SS Piston Design – BVV's 2-piece stainless steel piston outperforms the OEM CPS piston for superior durability and seal life.
- Restored Compression & Efficiency – New seals and wear band bring your pump back to factory compression specs for maximum recovery rates.
- Broad Compatibility – Fits CPS TRS21, BVV 2-Cylinder, BVV 4-Cylinder, and BVV CMEP-OL recovery pumps.
- Extends Pump Lifespan – Regular piston rebuilds prevent premature pump failure and protect your investment in professional recovery equipment.
- Backed by BVV – Sourced directly from BVV with full installation documentation and video support.
Use Cases
- Scheduled preventive maintenance on CPS TRS21 or BVV recovery pumps after heavy extraction cycles.
- Restoring pump compression after noticing reduced recovery speeds or increased cycle times.
- Upgrading from the original CPS piston to BVV's superior 2-piece stainless steel design.
- Rebuilding a pump that has been in storage or returned from field use.
- Replacing worn seals and wear bands on BVV 4-Cylinder pumps (note: 2 kits required for 4-cylinder units).
- Completing a full pump overhaul alongside other service components for a like-new rebuild.
Directions for Use
- Ensure the pump is fully depressurized and disconnected from all gas sources before beginning disassembly.
- Remove the existing top piston assembly following the BVV Pump Seal Rebuild Instructions (PDF linked below).
- Use the BVV Piston Tool (SKU: BVV-TL1) to properly seat and install the new piston — use of this tool is required; damage caused by improper installation is not covered.
- Apply Loctite 242 (blue threadlocker) as directed during reassembly to secure piston components.
- Reassemble the pump and perform a leak check before returning to service.
- Refer to the BVV 4 Cyl & 2 Cyl Pump Seal Rebuild Instructions for full step-by-step guidance.
What Growers Are Saying
"Dropped this kit in during our quarterly maintenance and the pump runs like new. The BVV piston is noticeably better than the stock CPS part."
— Marcus T., Commercial Extractor
"Easy rebuild with the right tools. The instructions are clear and the kit had everything I needed. Back up and running in under an hour."
— Sarah P., Licensed Processor
"We run our TRS21 hard and this upgrade kit has made a real difference in how long we go between rebuilds. Worth every penny."
— Daniel R., Extraction Lab Manager
Frequently Asked Questions
What pumps is this kit compatible with?
This kit fits the CPS TRS21 Anti-Spark/Explosion Pump, BVV 2-Cylinder Recovery Pump, BVV 4-Cylinder Recovery Pump, and BVV CMEP-OL Retro Fit Upgraded Head. Note: the 4-Cylinder and CMEP-OL units require 2 kits due to their 4-cylinder configuration.
Do I need any special tools to install this kit?
Yes. The BVV Piston Tool (SKU: BVV-TL1) and Loctite 242 (blue threadlocker) are required for proper installation. Using the piston tool is mandatory — damage caused by installing without it is not covered under warranty.
Is this a complete rebuild kit or just the seal?
This is a complete top piston assembly kit. It includes the top piston assembly, piston seal, and piston wear band — everything needed for a full top-end rebuild.
How often should I rebuild my pump's piston?
Rebuild frequency depends on usage intensity. For high-volume commercial operations, inspect seals every 3–6 months. For lighter use, annual inspection is typically sufficient. Replace when you notice reduced recovery speed or increased pump cycling.
Where can I find installation instructions?
Full step-by-step instructions are available in the BVV 4 Cyl & 2 Cyl Pump Seal Rebuild Guide (PDF). Video walkthroughs are also included on this product page.
How should I store this kit if not installing immediately?
Store in a cool, dry location away from direct sunlight and solvents. Keep in original packaging until ready to install to protect the seals from contamination or degradation.
More about TRS21 / BVV Upgraded Top Piston Assembly:
BVV-3
Included in this kit: Top piston assembly with piston seal and piston wear band.
This upgrade kit can be used for the following recovery pumps:
- CPS TRS21 Anti-spark/explosion pump
- BVV 2 Cylinder Butane Recovery Pump ITS/ETL to ANSI/ISA Certified
- BVV 4 Cylinder Butane Recovery Pump ITS/ETL to ANSI/ISA Certified - Requires 2 kits because this unit has 4 cylinders.
BVV CMEP-OL Retro Fit Upgraded Head - Requires 2 kits because this unit has 4 cylinders.
BVV 4 Cyl & 2 Cyl Pump Seal Rebuild Instructions
If you have upgraded to the 2-piece SS piston design this kit is used to rebuild the piston seal and wear band. Piston tool (SKU: BVV-TL1) and Loctite 242 will be needed to properly install. If tool is not used the customer is responsible for any damage done to piston during assembly.
