Weld-On 10851 Pool 'R Spa 747 Blue PVC Solvent Cement 1 gal is specially formulated to create quick and sturdy bonds in wet environments. This PVC pipe cement creates a deep, high-contact fusion between pipes and fittings with interference fits up to 6 inches in diameter (and up to 4 inches for Schedule 80). It is formulated to address specific needs in pool, spa and whirlpool installation and repair, working effectively in wet conditions with an extremely fast setting time that allows pipes to be pressurized quickly. The medium-bodied PVC cement applies smoothly and can be used without primer on non-pressure systems if local codes permit. The solvent goes onto pipes with a blue color and fades to clear in sunlight.