Product · Rack-level coolant distribution
In-Rack Manifolds for high-density liquid cooling systems.
In-rack manifolds act as the central coolant distribution layer inside liquid-cooled high-density racks. They distribute coolant from the CDU to individual servers and collect return flow for scalable, serviceable infrastructure across GPU, HPC, colocation, and other heat-load deployments.
In-Rack Manifolds
The backbone of rack-level cooling.
While cold plates remove heat and CDUs control the loop, the manifold makes rack-level distribution possible. It routes coolant across servers, supports consistent thermal performance, and creates a common connection point between rack infrastructure and the cooling loop.
Built for dense rack environments.
Manifolds distribute cold coolant across multiple server nodes and collect return flow for recirculation, helping high-density racks stay organized, serviceable, and repeatable.
Where manifolds fit.
Modern liquid-cooled high-density infrastructure is built as a layered system, from facility-side cooling to rack distribution and server-level thermal transfer.
Step 1
CDU
Controls coolant flow and temperature, circulating fluid between facility water and the rack cooling loop.
Step 2
In-Rack Manifold
Distributes cold coolant evenly across servers and collects return flow.
Step 3
QDC + Routing
Quick disconnects and hoses connect servers to the manifold, enabling modular deployment and serviceability.
Step 4
Cold Plates
Cold plates remove heat directly from processors and transfer it into the liquid cooling loop.
Manifold Role
The central distribution spine.
Within the rack, the manifold receives coolant from the CDU, routes it evenly across multiple server nodes, and collects return flow for recirculation.
This centralized distribution layer enables consistent thermal performance and supports modular, serviceable rack design.
Why It Matters
Flow consistency across the rack.
A properly configured manifold helps deliver coolant evenly across server positions and reduces integration complexity in high-density rack environments.
It also creates a practical connection layer between CDU infrastructure, QDCs, hoses, and cold plate assemblies.
Operational Advantages
Designed for service access.
In-rack manifolds centralize connection points and support maintenance, server replacement, phased expansion, and QDC-based service workflows.
Clean manifold integration improves uptime planning in 24/7 compute environments.
Design Focus
Rack geometry matters.
Manifold configuration depends on rack layout, port count, coolant routing, CDU position, QDC selection, and cold plate connection architecture.
PAI supports sourcing alignment across CDU, manifold, QDC, routing, and cold plate categories.
Technical characteristics.
Manifold quality affects coolant distribution, pressure management, serviceability, and overall rack-level cooling stability.
| Category | What matters | Why it matters |
|---|---|---|
| Flow distribution | Parallel coolant routing across multiple ports | Ensures even cooling and reduces the risk of rack-level hotspots |
| Pressure management | Low pressure drop through rack distribution paths | Reduces stress on pumps and improves overall cooling efficiency |
| Material construction | Corrosion-resistant metals such as stainless steel | Supports long-term durability in liquid cooling environments |
| Serviceability | Accessible ports, mounting, and connection points | Supports fast installation, maintenance, and system modifications |
| Integrated protection | Compatibility with air relief, pressure relief, and QDC-based routing | Helps protect the cooling system and improve operational reliability |
Available Configurations
Rack-ready manifold options.
In-rack supply and return manifold assemblies, multi-port coolant distribution layouts, rack-height configurations, and custom geometry options.
Available for projects requiring QDC integration, blind-mate server connections, CDU alignment, and project-specific rack layouts.
Target Environments
High-density GPU, HPC, and colocation racks.
GPU racks, HPC systems, rack liquid cooling deployments with CDU integration, enterprise deployments, colocation programs, modular data centers, and retrofit cooling architectures.
Request manifold supply for your deployment.
Pacific AI Infrastructure supports in-rack manifold sourcing for liquid-cooled GPU, HPC, colocation, modular data center, and other high heat-load deployments. Share your rack architecture, server count, coolant loop design, and deployment timeline to review configuration fit and supply alignment.