Speciﬁcally designed to meet the high demands of today’s motorhomes, trailers and on demand hot water heaters. Our new High Flow Type I 400,000 BTU (red nut) pigtails are designed for those applications that require more than 200,000 BTU’s. The new High Flow pigtails are designed with both excess ﬂow and thermal link safety features, same as the green nut Type I. The RV Thermo Pigtail (Type I ACME) provides a safe, user-friendly connection from your Marshall Excelsior MEGR-253/253H regulator to a standard LP gas cylinder without the use of a wrench. The easy to tighten nylon nut swivels on a connector ﬁtting that is heat sensitive. Between 240°F and 300°F the brass nipple displaces (approximately 1/4”) closing the cylinder valve module and stopping the ﬂow of gas from the container. Inside the brass nipple is a ﬂow-limiting device designed to sense excess gas ﬂow. If excessive gas ﬂow is detected, the RV Thermo Pigtail will shut down the ﬂow to a maximum of 10 SCFH (by-pass ﬂow). This product is required by RVIA (Recreational Vehicle Industry Association) as original equipment on your RV and should be maintained to the highest standards. Because of this required standard, when opening or reﬁlling your LP gas cylinders, it could take as long as 20 minutes to re-pressurize your LP gas system for normal appliance(s) operation.