Polaris Vac-Sweep 380 / 280 / 180 / 280 TankTrax Pressure Cleaner Collar Back-up Valve Polaris Vac-Sweep 380 / 280 / 180 / 280 TankTrax Pressure Cleaner Collar Back-up Valve (G57) The collar for the back-up valve is a replacement part made by Polaris. The same high-quality materials were used to manufacture the original factory part. Making this a genuine OEM product. This collar was designed for the back-up valve and this part is meant to connect to the feed hose while also being a protective cover for the internal mechanism. It is meant to open itself every 2 ½ to 3 minutes for about 30 seconds backing the cleaner out of any tight corners or trouble spots. This part is white and located approximately 18 inches from the head of the cleaner. It’s not uncommon for this part to deteriorate or break after an extended length of time or use but is very simple and easy to replace. It is threaded and meant to screw into the case or bottom housing of the valve.