Thermaltake

Thermaltake CL-W214-CU00BL-B Pacific C-Pro PETG Fitting Pack

4.7 (561 reviews)

Six-pack of G1/4 PETG compression fittings with four integrated O-rings each — engineered to eliminate hard-tube loop leaks before they start.

$54.99*$59.99Save 8%
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Thermaltake Pacific C-Pro PETG Fitting Pack delivers six G1/4 compression fittings engineered specifically for 16mm OD hard tubing in PETG, acrylic, or copper. The defining engineering feature is the four-O-ring compression architecture: where single-ring fittings rely on a single sealing interface, each C-Pro fitting uses four O-rings distributed across the compression zone, creating redundant leak prevention that absorbs minor tube cut imperfections or slight misalignments during assembly. The copper and aluminum composite body measures 26mm in diameter by 21mm in height — compact enough for dense routing in mid-tower builds — and carries a corrosion-resistant surface treatment for sustained coolant exposure.

These fittings target builders who have committed to hard-line loops and want the security of professional-grade compression seals without sourcing components piecemeal. The G1/4 thread standard ensures compatibility across the entire ecosystem of custom loop hardware: EK, Corsair, EKWB, Barrow, and Bykski components all use G1/4 ports. The included open-end wrench is a thoughtful addition — C-Pro bodies have specific geometry, and an appropriately fitted wrench prevents the cosmetic damage that adjustable tools cause on precision-machined fittings. The six-pack configuration covers a basic single-radiator loop with room for a few bends; complex dual-loop or multi-radiator configurations will require additional packs.

Key Features

Fitment Reimagined: This new concept makes it easier than ever to install custom hard tube liquid-cooling loops.

Four Built in O-rings: Maximum leak prevention, secure compression seal, and peace of mind.

Protection You Expect: Surface treated and a special coating finish provides increased durability and protection from corrosion.

Build It Your Way: Compatible with liquid cooling components that utilize G1/4 thread ports and 16mm OD PETG, Acrylic, and Copper hard tubing.

Exclusively Designed Open-End Wrench is Included

Specifications

Model
Pacific C-Pro G1/4 PETG 16mm OD
Color
Black
Dimensions
D26 x 21mm (H)
Thread
G 1/4
Compatible Tubing OD
16mm
Compatible Tubing Materials
PETG, Acrylic, Copper
Material
Copper + Aluminum (CU + AL)
O-Rings per Fitting
4
Quantity per Pack
6 fittings
Included Accessory
Open-end wrench

Pros & Cons

👍 Pros

  • Four integrated O-rings per fitting provide redundant compression sealing at each connection point, reducing leak risk during initial pressurization
  • G1/4 thread compatibility ensures drop-in fitment with virtually every custom loop component from major waterblock and radiator manufacturers
  • Supports 16mm OD PETG, acrylic, and copper hard tubing — three common hard-line materials covered by a single fitting SKU
  • Surface-treated copper/aluminum construction provides corrosion resistance under sustained coolant exposure
  • Included open-end wrench is sized for the C-Pro body, eliminating improvised tooling that risks cosmetic or structural damage

👎 Cons

  • Strictly 16mm OD specification — incompatible with the more common 12mm or 13mm OD tubing used in smaller ITX and mATX builds without purchasing a separate fitting size
  • Copper and aluminum in the same fitting body creates a galvanic corrosion risk if the coolant chemistry is not actively managed with compatible inhibitors
  • Six-pack quantity may under-supply complex dual-radiator loops with multiple 90° bends requiring 10–14 fittings total
  • The surface treatment coating, while protective, can show tooling marks if non-included wrenches are used during installation or repositioning
  • No swivel rotation capability after installation — tube routing must be finalized before torquing, unlike angled rotary fittings

Frequently Asked Questions

The Pacific C-Pro fittings are specified for 16mm OD (outer diameter) hard tubing in PETG, acrylic, or copper. They will not correctly seat 13mm or 12mm OD tubing — OD spec must match exactly for the compression seal to function.
Standard single-O-ring fittings rely on one compression point; the Pacific C-Pro's four built-in O-rings distribute the sealing force across multiple contact zones. This redundancy means a minor installation imperfection at one ring is compensated by the remaining seals, reducing leak probability during initial loop filling.
G1/4 thread (British Standard Pipe Parallel) — the universal standard for custom liquid cooling components. Virtually all water blocks, radiators, reservoirs, and pump tops from major manufacturers use G1/4 ports, making these fittings universally compatible within the custom loop ecosystem.
Thermaltake includes an exclusively designed open-end wrench with the pack specifically sized for the C-Pro body. Do not use adjustable pliers or improper wrenches — the fitting body is a copper/aluminum composite with a surface treatment that can be marred by incorrect tooling.
The fitting body is copper and aluminum with a corrosion-resistant surface coating. Standard pre-mixed distilled coolants with copper-compatible inhibitors are appropriate. Avoid coolants with silver kill coils or biocides that react with aluminum, as the fitting has both metal types present.