Frequently Asked Questions | Xiamen Jielin Plumbing Co., Ltd

What are the differences in flapper materials ?
There are three common materials on the market: PVC, rubber, and ABS. PVC flappers have a significant price advantage over other materials, making them widely used in the market. However, prolonged immersion in water can cause PVC to shrink, potentially leading to minor leaks in the flush valve. Therefore, regular inspection and timely replacement of leaking flappers are necessary. Rubber flappers are much more stable in water and do not deform easily, but they come at a higher cost. ABS flappers are the most durable option, with their sealing function primarily relying on a silicone gasket attached to the flapper. The advantage is that if an issue arises, there is no need to replace the entire flapper—only the worn-out silicone gasket needs to be changed, making maintenance more convenient.

What are the benefits of using stainless steel for toilet connected bolts ?
The bolt set is continuously submerged in the toilet tank. If rust or corrosion occurs, it can lead to breakage or leaks.

What are the function of the toilet cistern gasket ?
This product is designed for two-piece toilets, providing a seal between the tank and the bowl to prevent leaks.

What are the differences in lever materials ?
There are three common materials on the market: plastic, aluminum, and brass. Plastic levers are inexpensive and lightweight, but they tend to become brittle over time in bathroom environments, eventually breaking. Aluminum levers are also lightweight and easy to bend, making them adaptable to different toilet tank spaces. However, they are prone to deformation during transportation, which can affect sales. Brass levers are the most durable and can also be bent to fit, though not as easily as aluminum. Their only downside is the relatively higher cost.

What is the function of the overflow pipe ?
The overflow pipe serves two functions: First, When the water seal in the toilet bowl is insufficient, the refill tube of the inlet valve directs water through the overflow pipe to replenish the bowl. This helps form a water seal in the U-shaped trap, preventing sewer odors from escaping and contaminating the bathroom. Second, In the event of a severe malfunction or rupture of the inlet valve that prevents it from stopping the water flow, the overflow pipe allows excess water in the tank to drain out. This prevents the tank from overflowing, which could otherwise flood the bathroom or even adjacent rooms, causing significant damage.

What should be considered when purchasing toilet flush valve ?
First, consider whether the flush valve is intended for a two-piece or one-piece toilet. The base design of the flush valve differs based on the application: two-piece toilets use a nut to secure the flush valve, while one-piece toilets use a steel hook for fixation. Second, choose between an adjustable overflow pipe and a fixed overflow pipe. The length of the overflow pipe is determined by the working water level of the tank. If the working water level is uncertain, it is recommended to select an adjustable overflow pipe. The fixed overflow pipe has a default length of 200mm, which is suitable for most toilet tanks.

How to choose the water inlet size of the toilet fill valve ?
Europe and Africa use G3/8 ", the Middle East uses G3/8 "and G1/2", Asia and South America use G1/2, but Peru uses G7/8 "or 15/16-14NPSM, and North America uses 15/16-14NPSM.

What is difference between G7/8'' and 15/16-14NPSM ?
The G7/8" and 15/16-14NPSM inlet thread standards differ primarily in thread angle, pitch. The G7/8" follows the BSPP (British Standard Pipe Parallel) standard with a 55° thread angle and 11 TPI (threads per inch). In contrast, the 15/16-14NPSM adheres to the NPSM (National Pipe Straight Mechanical) standard with a 60° thread angle and 14 TPI.Although there are some differences in specifications,but it is not affected in the actual use of the toilet fill valve, and the G7/8 "and 15/16-14NPSM can be connected to the same water inlet pipe, and normal use.

How do I know if a flush handle will fit an American-style toilet tank?
Most toilet flush handles for American-style toilet tanks are designed to be widely compatible, but there are still a few details to check before replacement. First, confirm the mounting position of the original handle. Some toilet tanks use a front-mount flush handle, while others use a side-mount flush handle. This depends on whether the handle hole is located on the front side or the side wall of the tank. Choosing the correct mounting type helps the handle sit in the right direction and operate smoothly. Second, check the handle arm inside the tank. If the handle uses a plastic arm, the adjustment range is usually limited. If it uses a metal arm, such as aluminum or brass, the arm can often be slightly bent to adjust the swinging distance. This helps prevent the arm from touching the fill valve, flush valve, or tank wall during operation. For replacement use, it is always better to compare the mounting position and arm direction with the original handle before ordering. This can make installation easier and reduce compatibility problems.

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