Specification Brand : 8B8B BulletPoint1 : Backup Valve Compatible with Polaris/ Zodiac models: 180, 280, 380, 480 PRO, 3900 Sport, Vac-Sweep 380, Vac-Sweep 280, 280 TankTrax. BulletPoint2 : G53 Gear Mechanism:Made of friction-resistant and stable POM material. Pom has a very low coefficient of friction and good geometric stability, especially suitable for the manufacture of gears and bearings, this material is more able to withstand high water pressure operation. BulletPoint3 : Upgrade: pool backup valve compared with the another polaris backup valve for pool cleaner, we have upgraded the shell material, made of crack-resistant polymer blend, which is more wear-resistant than the previous product, And it is not easily damaged and has twice the life span. BulletPoint4 : 280Backup Valve Function: Solve the issue when your pool cleaner is stuck on an obstacle, although your backup valve is still open, water will no longer be sprayed from the nozzle, and keep the water out. BulletPoint5 : G52 Backup Valve Package Contents: G53 mechanism, G54 housing kit and G57 collar. Color : White ItemName : 8B8B G52 Backup Valve Replacement for Polaris Pool Cleaner Parts, Compatible with Polaris 180,280,380,480,3900 Pool Cleaner, The valve body has been reinforced,Replacement For Zodiac G52 ItemPackageDimensions_Height : 3.5 inches ItemPackageDimensions_Length : 6.5 inches ItemPackageDimensions_Width : 3.5 inches ItemTypeKeyword : swimming-pool-and-spa-replacement-parts ItemTypeName : Backup Valve Manufacturer : 8B8B ModelName : Backup Valve ModelNumber : G52 PartNumber : G52 ProductDescription : Backup Valve Compatible with Polaris/ Zodiac models: 180, 280, 380, 480 PRO, 3900 Sport, Vac-Sweep 380, Vac-Sweep 280, 280 TankTrax. G53 Gear Mechanism:Made of friction-resistant and stable POM material. Pom has a very low coefficient of friction and good geometric stability, especially suitable for the manufacture of gears and bearings, this material is more able to withstand high water pressure operation. Upgrade: pool backup valve compared with the another polaris backup valve for pool cleaner, we have upgraded the shell material, made of crack-resistant polymer blend, which is more wear-resistant than the previous product, And it is not easily damaged and has twice the life span. 280Backup Valve Function: Solve the issue when your pool cleaner is stuck on an obstacle, although your backup valve is still open, water will no longer be sprayed from the nozzle, and keep the water out. G52 Backup Valve Package Contents: G53 mechanism, G54 housing kit and G57 collar.