diff --git a/api/bro_upload/templates/registration_GMW_Construction.html b/api/bro_upload/templates/registration_GMW_Construction.html
index 6010038..84c81d7 100644
--- a/api/bro_upload/templates/registration_GMW_Construction.html
+++ b/api/bro_upload/templates/registration_GMW_Construction.html
@@ -47,7 +47,9 @@
                 <ns:artesianWellCapPresent>{{ monitoringtube.artesianWellCapPresent }}</ns:artesianWellCapPresent>
                 <ns:sedimentSumpPresent>{{ monitoringtube.sedimentSumpPresent }}</ns:sedimentSumpPresent>
                 <ns:numberOfGeoOhmCables>{{ monitoringtube.numberOfGeoOhmCables }}</ns:numberOfGeoOhmCables>
+{%              if monitoringTube.tubeTopDiameter %}
                 <ns:tubeTopDiameter uom="mm">{{ monitoringtube.tubeTopDiameter }}</ns:tubeTopDiameter>
+{%              endif %}
                 <ns:variableDiameter>{{ monitoringtube.variableDiameter }}</ns:variableDiameter>
                 <ns:tubeStatus codeSpace="urn:bro:gmw:TubeStatus">{{ monitoringtube.tubeStatus }}</ns:tubeStatus>
                 <ns:tubeTopPosition uom="m">{{ monitoringtube.tubeTopPosition }}</ns:tubeTopPosition>
diff --git a/api/bro_upload/templates/replace_GMW_Construction.html b/api/bro_upload/templates/replace_GMW_Construction.html
index fad3138..bcf57ff 100644
--- a/api/bro_upload/templates/replace_GMW_Construction.html
+++ b/api/bro_upload/templates/replace_GMW_Construction.html
@@ -49,7 +49,9 @@
                 <ns:artesianWellCapPresent>{{ monitoringtube.artesianWellCapPresent }}</ns:artesianWellCapPresent>
                 <ns:sedimentSumpPresent>{{ monitoringtube.sedimentSumpPresent }}</ns:sedimentSumpPresent>
                 <ns:numberOfGeoOhmCables>{{ monitoringtube.numberOfGeoOhmCables }}</ns:numberOfGeoOhmCables>
+{%              if monitoringTube.tubeTopDiameter %}
                 <ns:tubeTopDiameter uom="mm">{{ monitoringtube.tubeTopDiameter }}</ns:tubeTopDiameter>
+{%              endif %}
                 <ns:variableDiameter>{{ monitoringtube.variableDiameter }}</ns:variableDiameter>
                 <ns:tubeStatus codeSpace="urn:bro:gmw:TubeStatus">{{ monitoringtube.tubeStatus }}</ns:tubeStatus>
                 <ns:tubeTopPosition uom="m">{{ monitoringtube.tubeTopPosition }}</ns:tubeTopPosition>