MSL height (US Feet) - EPSG:8052

WKT

VERTCS["MSL_height_(ftUS)", 
	VDATUM["Mean_Sea_Level"], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Foot_US", 0.3048006096012192]]

WKT2

VERTCRS["MSL_height_(ftUS)", 
	VDATUM["Mean_Sea_Level"], 
	CS[vertical, 1], 
	AXIS["Gravity-related height (H)", up, 
		LENGTHUNIT["Foot_US", 0.3048006096012192]], 
	ID["EPSG", "8052"]]

Data from @esri/proj-codes

{
  "wkid": 8052,
  "latestWkid": 8052,
  "macro": "PE_VCS_MSL_HT_FTUS",
  "name": "MSL_height_(ftUS)",
  "wkt": "VERTCS[\"MSL_height_(ftUS)\",VDATUM[\"Mean_Sea_Level\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Foot_US\",0.3048006096012192]]",
  "wkt2": "VERTCRS[\"MSL_height_(ftUS)\",VDATUM[\"Mean_Sea_Level\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Foot_US\",0.3048006096012192]],ID[\"EPSG\",\"8052\"]]",
  "description": "MSL height (US Feet)",
  "authority": "EPSG",
  "version": "9.2(10.8.0)",
  "deprecated": "no",
  "areaname": "USA",
  "extent": {
    "slat": 15.56,
    "nlat": 74.71,
    "llon": 167.65,
    "rlon": -65.69
  }
}