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Black cylindrical fitting with knurled sides and G 1/4 thread

Thermaltake

Thermaltake CL-W038-CU00BL-A Pacific DIY Cooling 1/2" Fill-Port Fitting G 1/4

SKU CH-RX3T-SDB3X MPN CL-W038-CU00BL-A

A 1/2-inch fill-port fitting with G 1/4 thread for custom liquid-cooling loops

  • Product typeFittings
  • Key featuresDimension: ?22 × 26 (H) (mm) Applicable: ID : 1/2 in( 13 mm
  • G 1/4 thread fits standard water-cooling loops
  • 1/2 inch inner diameter suits 13 mm tubing
  • Black chrome plated brass resists corrosion
  • High flow leak free design maintains pressure
  • Compact 22 by 26 mm footprint saves space

Black Chrome Fill-Port Fitting for Custom Loops

The Thermaltake Pacific CL-W038-CU00BL-A is a G 1/4 threaded fill-port fitting machined from copper with a black chrome finish. It accepts 13 mm inner-diameter tubing and provides a dedicated fill point for DIY liquid-cooling builders who want a clean, leak-free reservoir connection.

Low-Profile Brass Construction

At 22 mm wide by 26 mm high and weighing 42 g, the fitting adds minimal restriction to flow while the black chrome plated brass body resists corrosion. The precision threads seal reliably under normal loop pressure without requiring excessive torque, keeping noise and thermal impact negligible.

Stop-to-Tube Design Simplifies Assembly

The integrated stop feature prevents tubing from sliding past the correct insertion depth, reducing the chance of leaks during initial fill and maintenance. No extra clamps or tools are needed beyond standard G 1/4 installation, so builders can complete the loop faster and with fewer potential failure points.

How it compares

Measured against everything we stock in Heatsinks & Water Blocks, at today’s prices. Recalculated every night.

Price $3.99
Cheaper than about 95% of the 609 comparable items (median $15.99).

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Specifications

Product
Brand nameThermaltake
Product linePacific
Model nameCL-W038-CU00BL-A
Product typeFittings
Size & build
Shipping weight0.07 kg
Package size58 × 56 × 18 mm

Questions about this item

How do I install the G 1/4 fill-port fitting and what step is often missed?

Thread the G 1/4 end into the reservoir port by hand, then tighten with a 22 mm wrench; the step often missed is fully seating the 13 mm inner-diameter tube onto the barbed stop so the O-ring seals.

What maintenance or replacement will this brass fitting need later?

Inspect the black chrome plating and O-ring annually; replace the fitting if corrosion appears or if the seal weeps, otherwise no scheduled replacement is required.

What limit appears first during sustained loop operation?

The 13 mm tube inner diameter sets the maximum flow rate; exceeding the pump’s head pressure at that bore causes turbulence before the fitting itself restricts flow.

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