As an expert plumber, I can provide some additional insights regarding the question.
There isn't a specific product designed to "unglue" solvent welded connections in PVC, CPVC, and DWV (drain-waste-vent) pipes. Solvent welding creates a strong and permanent bond between the pipes, and reversing this process is challenging. However, there are a few alternatives you can try:
- Heat application: Applying heat to the glued joint can soften the adhesive, making it easier to separate the pipes. Use a heat gun or a hairdryer on a low heat setting to warm the joint. Be cautious not to overheat or damage the pipes.
- Mechanical force: After heating the joint, try twisting and pulling the pipes apart using pliers, a wrench, or a similar tool. Apply gradual and controlled force to avoid damaging the pipes.
- Cutting the joint: If separating the pipes is necessary, you may need to cut the joint. Use a fine-tooth saw or a pipe cutter to carefully cut through the glued connection. This method requires replacing the section of pipe afterward.
Regarding the minimum horizontal drop or slope per foot for 3" DWV pipe, the recommended minimum slope is typically 1/4 inch per foot. This slope allows for proper drainage by maintaining a sufficient velocity to carry waste materials through the pipe. While there isn't a maximum slope, it's important to consider local plumbing codes and guidelines to ensure proper installation.
Please note that these recommendations are general guidelines, and it's always advisable to consult with a professional plumber who can assess the specific situation and provide expert advice tailored to your needs.