Chicago Fittings XR-21J-16-36-ZDC 1" IPS x 1" MPT X-Riser® without Bracket - Natural gas and propane gas systems should have as few joints as possible and, more importantly, those joints should be located above ground wherever possible. The X-Riser® with an integral service head adapter accomplishes both of these criteria. The use of an X-Riser® removes a minimum of two below grade joints per riser when compared to that of a standard pigtail style anodeless riser. In addition, those joints buried below ground are now moved to a single above grade joint, eliminating the risks and liabilities associated with below grade joints.