PRVD02 height - EPSG:6641

WKT

VERTCS["PRVD02_height", 
	VDATUM["Puerto_Rico_Vertical_Datum_of_2002"], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["PRVD02_height", 
	VDATUM["Puerto_Rico_Vertical_Datum_of_2002"], 
	CS[vertical, 1], 
	AXIS["Gravity-related height (H)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["EPSG", "6641"]]

Data from @esri/proj-codes

{
  "wkid": 6641,
  "latestWkid": 6641,
  "macro": "PE_VCS_PRVD02_HT",
  "name": "PRVD02_height",
  "wkt": "VERTCS[\"PRVD02_height\",VDATUM[\"Puerto_Rico_Vertical_Datum_of_2002\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"PRVD02_height\",VDATUM[\"Puerto_Rico_Vertical_Datum_of_2002\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"EPSG\",\"6641\"]]",
  "description": "PRVD02 height",
  "authority": "EPSG",
  "version": "8.2.10(10.3.1)",
  "deprecated": "no",
  "areaname": "Puerto Rico - onshore",
  "extent": {
    "slat": 17.87,
    "nlat": 18.57,
    "llon": -67.97,
    "rlon": -65.19
  }
}