1. How to connect the overflow tube to the overflow elbow in a bathtub drain kit?

Plumberstar bathtub drain kits adopt simple plug-in sealed joints to link overflow pipes and overflow elbows. No complicated tools are required, and the connection stays tight and leak-free after installation.

Start by fitting the overflow elbow to the bathtub’s overflow hole. Then wipe the sealing surface smooth and clear of any dirt. Line up the overflow pipe with the elbow’s socket. Most standard models seal by direct insertion — push the pipe all the way to the socket base for a tight, gap-free connection.

Heavy-duty upgraded models come with lock nuts or fixing clamps. After inserting the pipe, lightly tighten the nut to compress the inner seal. This stops pipe detachment and water leakage. The whole joint relies on structural fit and compressed rubber gaskets to complete sealing.

2. Does the bathtub drain kit comply with international plumbing codes?

Our full bathtub drain kits meet widely accepted plumbing rules around the world. We adjust every batch to fit standards from your selling area, including North America, the EU, Australia, and New Zealand.

All bathtub drains shipped to the US and Canada conform to IPC and UPC codes. Each finished drain goes through full tightness, anti-backflow, and leak testing under ASME A112.18.2 drain fitting rules. All brass parts that contact water satisfy NSF/ANSI 61 drinking water safety and NSF/ANSI 372 low-lead limits. 

Versions for European markets follow EU EN drain fitting standards with standard BSP threads compatible with local piping. Sealing efficiency, drainage flow rate, and temperature resistance all satisfy EU building plumbing thresholds. Bathtub drains for Australia and New Zealand are manufactured to AS/NZS specifications, and we assist customers to apply for compulsory WaterMark certification to meet local construction access rules.

We make bathtub drain sets built to standards in more than 22 areas each month. Every batch heading to North America passes third-party low-lead and leak testing before leaving our factory.

3. What are the surface treatment processes of the bathtub drain fitting kit?

Our bathtub drain kits offer six different surface styles. The choices are bright chrome, brushed nickel, brushed chrome, matte black, antique bronze, and sandblasted finish. We pick matching surfaces to fit various bathroom looks, brand positioning, and export market standards.

Our standard items use three-layer plating made of copper, nickel, and chrome. The full coating thickness sits between 10μm and 18μm. Every part gets a full prep process before plating. Workers polish each piece mechanically, strip away grease, clean parts with ultrasonic tools, and activate the surface layer.

We have multiple plating quality levels. They pass neutral salt spray tests ranging from 240 hours to 480 hours. The coating holds up well against rust in moist bathroom spaces.

All raw plating materials follow RoHS and REACH environmental standards for overseas shipments. We hand over matching test reports whenever you ask. Independent labs, including SGS, Intertek, and BV, may come to run material and surface inspections at our factory.

4. Can we order a mixed container of different bathtub drain fitting kits？

Plumberstar supports mixed container orders for different bathtub drain kits. This meets your different market needs. It also lowers logistics costs and makes better use of container space.

You can mix any models, sizes, and styles in one container. It depends on your market, stock, and sales plan. You can choose pop-up, flip-top, overflow, or non-overflow types. We will check quantity, specs, and package sizes based on your list. 

We have a professional team for the whole process. This includes order check, production, loading, customs declaration, and documents. Mixed loading won’t affect production time or delivery. We provide full documents for you. These include a packing list, invoice, customs materials, and product certificates. They meet all your customs clearance and pickup needs at the destination port.

5. What is the MOQ of the bathtub drain fitting kit?

As a professional valve supplier, Plumberstar has a flexible MOQ for bathtub drain kits. It fits foreign trade customers’ needs. It works for small trial orders, samples, channel replenishment, and large project orders.

For standard models with universal specs and existing molds, our MOQ is 500. This lets you place small trial orders. You can test the local market, get product certifications, or send samples to customers. New customers and small orders won’t feel pressured by high MOQ.

For non-standard drain kits, such as custom colors, logos, packaging, or special structures, the MOQ may vary slightly based on your custom needs. Custom orders require extra work: machine adjustments, line changes, electroplating, and packaging. We will try our best to lower the MOQ. We only need to cover basic production costs. We want to help you promote the market and prepare for projects.

6. Has the bathtub drain fitting kit undergone 100% leak testing?

Every complete bathtub drain kit runs mandatory 100% leak testing before leaving our factory. We use digital hydraulic testers to check the main drain body, overflow parts, connecting elbows, and all sealing gaskets one by one before packing.

During inspection, we fill the whole assembly with water and hold pressure steady at 0.4 bar for 5 minutes straight. Staff check all thread joints and sealing contact surfaces thoroughly. Any trace of water seepage leads to rejection; only leak-free units move to packing lines.

This test flow is designed referencing the standard EN 274 for drainage fittings. The consistent sealing performance fits home renovation, hotel construction, and export bulk orders alike.

7. Can I change the specifications or quantity of the bathtub drain kit after the order is confirmed?

Before production start-up, the product specification and order quantity can be changed freely without extra cost. During production, the price of the produced part and the mold opening fee for the new specification must be paid to change the product specification. The corresponding fee shall be paid according to the actual adjustment proportion for increasing or decreasing the order quantity. After production is completed, the product specification cannot be changed. All changes must be confirmed in writing to avoid subsequent disputes.