I purchased a genuine Weber adapter hose to use with my Weber Q about 8 years ago. Have not used it much and usually leave it attached to the tank and grill under a covered patio during the summer grilling months. Always turn the gas off at the tank and let the propane burn out at the end of the grilling session to relieve pressure in the hose. However, the last time I changed out the propane cylinder I noticed oil dripping out of the collar at the tank end. After doing a little research, I found that oily plasticizers leaching from rubber high pressure propane hoses is a common issue. These hoses should come with a warning to always disconnect the hose from the appliance and the tank when not in use. Don't know yet if the oil has damaged the regulator in any way. Perhaps someone at Weber can offer some insight on this issue.