I have 2 single body regulators that are both dual gauge. One is brand new and one is very slightly used, but like new condition. The slightly used one has a barb, but no check valve. I'm looking to trade them for one dual body regulator with 3 gauges and two barbs with check valves. I know you are supposed to be able to take the high pressure gauge off and attach two single bodies, but I havent had any luck getting it to budge and I thought there might be someone out there who would rather have two single body, dual gauge regulators. I'm looking for a dual body in new or like new condition. Thanks.