Tsunami 21999-0707 Regenerative Dryer Piston Replacement Service Kit

Tsunami 21999-0707 Regenerative Dryer Piston Replacement Kit

The Tsunami 21999-0707 piston replacement kit, manufactured by Suburban Manufacturing Group, is an OEM service part used across Tsunami Pure Series and Ultra Series regenerative desiccant air dryers. This kit is used to service the internal piston assembly that controls or supports regenerative tower cycling, depending on dryer configuration.

This component is a critical wear item in the regeneration system, and replacing it on a regular maintenance schedule helps maintain proper switching between towers, consistent purge performance, and optimal air drying efficiency.

Compatible Models (OEM Verified Fitment)

This piston kit is used across the full range of Tsunami regenerative dryers, including:

✔ Pure Series Dryers

• Pure-1
• Pure-3
• Pure-5 / Pure-5T
• Pure-7
• Pure-10
• Pure-20
• Pure-30

✔ Ultra Series Dryers

• Ultra-10 (40 CFM)
• Ultra-15 (60 CFM)
• Ultra-20 (80 CFM)
• Ultra-30 (120 CFM)
• Ultra-40 (Rail system configurations)
• Ultra-50 (Rail system configurations)
• Ultra-75 (Rail system configurations)
• Ultra-100 (Rail system configurations)

Application Notes (Important)

• Each regenerative dryer uses one piston kit per tower

It is recommended to replace the piston kit every 2–3 years as preventative maintenance to avoid:

• Sticking or sluggish piston movement
• Improper tower switching during regeneration cycles
• Increased moisture breakthrough
• Loss of dryer efficiency or inconsistent dew point performance

Features:

• OEM replacement part from Suburban Manufacturing (Tsunami)
• Restores proper regenerative tower cycling function
• Helps maintain consistent drying performance across both towers
• Designed for continuous-duty industrial compressor systems
• Direct replacement for factory-installed piston assemblies

Important Fitment Note:

Always verify part number 21999-0707 against your dryer’s service manual or parts breakdown. While this kit is used across the full Pure and Ultra regenerative dryer lines, internal revisions and control configurations may vary by production year and system design.

You Will Receive

One (1) Tsunami 21999-0707 regenerative dryer piston replacement kit

⚠️ Note: Two kits are required per full dryer system — one for each tower.