Alphacool Eiszapfen G1/4 inch Stop Plug Deep Black - Brass Blanking Plug with EPDM O-Ring (17217)

When a premium water cooling loop demands a clean, leak-free finish, the Alphacool Eiszapfen G1/4" Stop Plug steps in where ordinary blanking plugs fall short. Machined from solid brass and finished in a deep matte black, this plug is not just a functional seal but a deliberate design choice for builders who obsess over every detail. Unlike generic plastic or chrome-plated alternatives, the Eiszapfen plug resists corrosion, maintains its appearance over years of thermal cycling, and offers a low-profile silhouette that sits flush with your components.

Highlights

• Precision G1/4" thread for universal compatibility with radiators, pumps, reservoirs, and water blocks
• Solid brass construction with a deep black, matte finish for a discreet, high-end aesthetic
• Integrated EPDM O-ring ensures a reliable, maintenance-free seal without the need for thread tape
• Knurled grip edge allows easy hand-tightening, even in tight spaces or with wet fingers
• Low-profile design minimizes protrusion, ideal for compact builds or crowded manifold areas
• Part of the acclaimed Alphacool Eiszapfen series, known for quality and longevity

In daily use

Installing the Eiszapfen Stop Plug takes seconds: simply thread it into any unused G1/4" port and tighten by hand until the O-ring compresses. The knurled surface provides a secure grip without tools, preventing over-tightening that could damage acrylic or acetal components. Once seated, the plug becomes virtually invisible, blending into the blacked-out aesthetic of modern liquid cooling systems. Whether you're sealing a spare port on a multi-inlet radiator, capping a drain valve, or temporarily closing a loop during maintenance, this plug delivers a dependable seal that withstands pressure and temperature fluctuations. Its brass body also acts as a subtle heat conductor, helping to dissipate minor thermal loads from nearby components.

Full specifications

• Product type: Stop plug / blanking plug
• Thread size: G1/4" (BSPP standard)
• Material: Brass
• Color: Deep black (matte finish)
• Seal type: EPDM O-ring
• Series: Alphacool Eiszapfen
• Application: PC water cooling systems
• Finish: Matte black
• Design: Low profile, knurled grip
• Compatibility: Universal G1/4" ports on radiators, pumps, reservoirs, blocks
• Installation: Hand-tighten
• Corrosion resistance: High
• Quantity per pack: 1 piece
• Function: Sealing unused G1/4" ports
• Durability: High-quality construction for long-term use

Final note

For builders who refuse to compromise on either performance or aesthetics, the Alphacool Eiszapfen Stop Plug is a small component that makes a big difference. Its robust brass build and elegant black finish ensure your loop stays sealed and stylish for years to come.