Sink drain

The most critical factor is the material grade. For high-end or commercial projects, 304 Stainless Steel is the industry standard due to its superior corrosion resistance and durability. For budget-conscious retail markets, Brass with Chrome plating or ABS plastic may be used, but you must ensure the plating thickness meets salt spray test standards (usually 24-48 hours) to prevent premature rusting or peeling.

Sink drains are not universal. You must specify the thread standard: G thread (BSP) is common in Europe and Asia, while NPT or NPS is required for the North American market. Additionally, verify the tailpiece diameter (typically 1-1/4" for bathroom sinks and 1-1/2" for kitchen sinks) and whether the sink has an overflow hole, as this determines if you need a 'with overflow' or 'without overflow' drain body.

Modern buyers prefer Pop-up click-clack mechanisms over traditional rubber plugs. Ensure the internal spring has been cycle-tested for at least 50,000 uses. For kitchen drains, look for removable strainer baskets with anti-clogging designs. For high-traffic commercial areas, vandal-resistant fixed grids are often preferred to prevent theft or tampering.

To enter the US market, products should ideally meet CUPC (Uniform Plumbing Code) and NSF/ANSI 61 (lead-free) standards. For the UK, WRAS approval is highly valued. For the EU, look for CE marking and compliance with EN 274. Sourcing from suppliers on Made-in-China.com who hold ISO 9001 certification ensures a baseline for quality management systems.

Request a Pre-Shipment Inspection (PSI) where a third party performs a water pressure test and air-tightness test on a random sample (AQL 2.5/4.0). Ensure the silicone gaskets are included and made of high-grade non-recycled material, as poor-quality washers are the #1 cause of post-installation leaks.

Focus on packaging and branding customization. Since sink drains are heavy, ask for reinforced 5-layer corrugated boxes to prevent damage during sea freight. Negotiate based on material weight; a heavier brass drain usually indicates higher quality and better wall thickness. Use Made-in-China.com's Secured Trading services to protect your payment until the goods pass inspection.

Sink drains are high-density goods. For bulk orders, FOB (Free On Board) is recommended to maintain control over shipping costs. If shipping to the US or Europe, ensure the supplier provides a detailed Packing List and Commercial Invoice with the correct HS Code (typically 7324 or 7418) to avoid customs delays and ensure accurate duty calculation.

Always verify the supplier's Business License and Export License. On Made-in-China.com, prioritize Audited Suppliers who have undergone on-site verification by third-party agencies like SGS or Intertek. This reduces the risk of dealing with 'trading shells' and ensures you are working with a legitimate factory capable of handling OEM/ODM requirements.