GROCO Drain Plug with O-Ring for ARG Strainers 2008 & Older - ARG-506

The GROCO Drain Plug & O-Ring (ARG-506) is a specific replacement part designed for GROCO ARG series raw water strainers manufactured on or before August 1, 2008. Maintaining a proper seal on your strainer is vital to prevent vacuum leaks that can cause your engine's cooling system to lose its prime.

Legacy Strainer Compatibility

Because GROCO updated their strainer design in late 2008, choosing the correct plug based on your unit's manufacture date is essential for a watertight fit.

• Pre-2008 Units: This ARG-506 model is the correct "Old Style" replacement for strainers built before 08/01/2008.

• Modern Units: If your strainer was built after 2008, you will likely need the ARG-756 Drain Plug instead.

• Wide Range Support: This plug is compatible with the "Old Style" sight glasses across the entire series, including ARG-500, ARG-750, and ARG-1000 models.

Key Features

• Leak-Proof Seal: The kit includes the non-metallic wingnut plug and the necessary O-ring gasket to ensure a secure, airtight seal.

• Corrosion Resistant: Made from high-quality materials that won't seize or corrode when exposed to harsh salt or brackish water.

• Hand-Tighten Design: The wingnut shape allows for tool-free removal, making it easy to drain the strainer for winterization or to clear debris in tight engine rooms.

Technical Specifications

• Part Number: ARG-506

• UPC: 742985008878

• Weight: 0.01 lbs (approximate)

• Includes: 1 Drain Plug, 1 O-Ring Gasket

Summary Recommendation

If your boat features a classic GROCO ARG strainer installed before 2008, the ARG-506 is the mandatory replacement part for your maintenance kit. It is often recommended to keep a spare on board, as these small parts can easily be lost in the bilge during a mid-season cleaning.