R0552000 tank adapter with union and O-ring 4-piece compatible with for Zodiac DEV series D. models DEV48, DEV 60 and series filter models 100, 150, 200, 250.Also compatible with for Zodiac DEL, CV, , CJ and series filter. R0552000 tank adapter with union and O-ring 4-piece is made of high-quality plastic and brass, waterproof, , corrosion-resistant, good elasticity, good sealing, not easy to break. Easy installation: Easy installation could help you to save more time. , place the smaller, thicker o-ring onto the threads of the tank adapter.Secondly, place the larger, thinner o-ring onto the gauge housing. Precautions: If it is the first replacement, you need to pay attention,never start pump while standing within five feet of the filter or operate the filter system at more than 50 psi of pressure. Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Black Material:Plastic+Brass Package Contents: 1 * R0552000