There are many types of PVC pipe seals available, each with its own purpose and application. Here are a few of the most common types:

• Rubber gaskets: Rubber gaskets are a versatile type of seal that can be used in a variety of applications. They are typically made of EPDM or neoprene rubber and are available in a variety of sizes and shapes. Rubber gaskets are often used to seal joints between PVC pipes, as well as to seal pipes against moisture and other contaminants.
• O-rings: O-rings are a type of ring-shaped seal that is made of a resilient material, such as rubber or plastic. They are typically used to seal joints between two pipes, or to seal a pipe against a flange or other fitting. O-rings are available in a variety of sizes and materials, and can be used in a wide range of applications.
• Threaded seals: Threaded seals are used to seal threaded connections between PVC pipes. They are typically made of a metal, such as brass or stainless steel, and have a gasket or washer that helps to create a tight seal. Threaded seals are available in a variety of sizes and thread types.
• Compression seals: Compression seals are used to seal threaded connections between PVC pipes. They are typically made of a rubber or plastic material and have a metal ring that helps to create a tight seal. Compression seals are available in a variety of sizes and thread types.
• Solvent weld seals: Solvent weld seals are used to seal joints between PVC pipes. They are typically made of a solvent-based adhesive that melts the plastic of the pipes together. Solvent weld seals are available in a variety of sizes and shapes.
• The best type of PVC pipe seal for your application will depend on the specific requirements of the project. Consider the size and shape of the pipes, the type of joint, and the environmental conditions to choose the best seal for the job.
• Here are some additional factors to consider when choosing a PVC pipe seal:
• The pressure rating of the seal: The seal must be able to withstand the pressure of the fluid that will be flowing through the pipes.
• The temperature rating of the seal: The seal must be able to withstand the temperature of the fluid that will be flowing through the pipes.
• The chemical compatibility of the seal: The seal must be compatible with the fluid that will be flowing through the pipes.
• The longevity of the seal: The seal must be able to last for the expected lifespan of the pipes.
• If you are unsure of which type of PVC pipe seal to use, consult with a qualified professional.