diff --git a/pg_service_parser/conf/enums.py b/pg_service_parser/conf/enums.py
new file mode 100644
index 0000000..f44c624
--- /dev/null
+++ b/pg_service_parser/conf/enums.py
@@ -0,0 +1,10 @@
+from enum import Enum
+
+
+class SslModeEnum(Enum):
+    DISABLE = "disable"
+    ALLOW = "allow"
+    PREFER = "prefer"
+    REQUIRE = "require"
+    VERIFY_CA = "verify-ca"
+    VERIFY_FULL = "verify-full"
diff --git a/pg_service_parser/conf/service_settings.py b/pg_service_parser/conf/service_settings.py
index ccf89d8..5e7eaa1 100644
--- a/pg_service_parser/conf/service_settings.py
+++ b/pg_service_parser/conf/service_settings.py
@@ -1,3 +1,5 @@
+from pg_service_parser.conf.enums import SslModeEnum
+
 # Settings available for manual addition
 # See https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-PARAMKEYWORDS
 SERVICE_SETTINGS = {
@@ -10,8 +12,9 @@
         "description": "Password to be used if the server demands password authentication.",
     },
     "sslmode": {
-        "default": "",
+        "default": SslModeEnum.PREFER.value,
         "description": "This option determines whether or with what priority a secure SSL TCP/IP connection will be negotiated with the server.",
+        "values": SslModeEnum,
     },
     "passfile": {
         "default": "",
diff --git a/pg_service_parser/core/item_models.py b/pg_service_parser/core/item_models.py
index 5de0b65..eb5aa75 100644
--- a/pg_service_parser/core/item_models.py
+++ b/pg_service_parser/core/item_models.py
@@ -1,6 +1,7 @@
 from qgis.PyQt.QtCore import QAbstractTableModel, QModelIndex, Qt, pyqtSignal
 from qgis.PyQt.QtGui import QColorConstants, QFont
 
+from pg_service_parser.conf.enums import SslModeEnum
 from pg_service_parser.conf.service_settings import SERVICE_SETTINGS
 
 
@@ -8,6 +9,8 @@ class ServiceConfigModel(QAbstractTableModel):
     KEY_COL = 0
     VALUE_COL = 1
 
+    SSLMODE_KEY = "sslmode"
+
     is_dirty_changed = pyqtSignal(bool)  # Whether the model gets dirty or not
 
     def __init__(self, service_name: str, service_config: dict):
@@ -85,6 +88,9 @@ def data(self, index, role=Qt.ItemDataRole.DisplayRole):
                 or self.__model_data[key] != self.__original_data[key]
             ):
                 return QColorConstants.DarkGreen
+        elif role == Qt.ItemDataRole.UserRole:
+            if index.column() == self.VALUE_COL and key == self.SSLMODE_KEY:
+                return {key: [e.value for e in SslModeEnum]}
 
         return None
 
@@ -144,3 +150,11 @@ def invalid_settings(self):
         :return: List of invalid settings.
         """
         return [k for k, v in self.__model_data.items() if v.strip() == ""]
+
+    @staticmethod
+    def is_sslmode_edit_cell(index):
+        return (
+            index.column() == ServiceConfigModel.VALUE_COL
+            and isinstance(index.data(Qt.ItemDataRole.UserRole), dict)
+            and ServiceConfigModel.SSLMODE_KEY in index.data(Qt.ItemDataRole.UserRole)
+        )
diff --git a/pg_service_parser/gui/item_delegates.py b/pg_service_parser/gui/item_delegates.py
new file mode 100644
index 0000000..04767fd
--- /dev/null
+++ b/pg_service_parser/gui/item_delegates.py
@@ -0,0 +1,45 @@
+# Adapted from
+# https://github.com/xxyzz/WordDumb/blob/097dd6c1651fdc08b472e0bf639aec444b6e14ec/custom_lemmas.py#L398C1-L438C46
+
+from qgis.PyQt.QtCore import Qt
+from qgis.PyQt.QtWidgets import QComboBox, QStyledItemDelegate
+
+from pg_service_parser.core.item_models import ServiceConfigModel
+
+
+class ServiceConfigDelegate(QStyledItemDelegate):
+    def __init__(self, parent):
+        super().__init__(parent)
+
+    def createEditor(self, parent, option, index):
+        if ServiceConfigModel.is_sslmode_edit_cell(index):
+            options = list(index.data(Qt.ItemDataRole.UserRole).values())[0]
+            combo_box = QComboBox(parent)
+            if isinstance(options, list):
+                for value in options:
+                    combo_box.addItem(value, value)
+
+            combo_box.currentIndexChanged.connect(self.commit_and_close_editor)
+
+            return combo_box
+
+        return QStyledItemDelegate.createEditor(self, parent, option, index)
+
+    def commit_and_close_editor(self):
+        editor = self.sender()
+        self.commitData.emit(editor)
+        self.closeEditor.emit(editor)
+
+    def setEditorData(self, editor, index):
+        if ServiceConfigModel.is_sslmode_edit_cell(index):
+            value = index.data(Qt.ItemDataRole.DisplayRole)
+            editor.setCurrentText(value)
+        else:
+            QStyledItemDelegate.setEditorData(self, editor, index)
+
+    def setModelData(self, editor, model, index):
+        if ServiceConfigModel.is_sslmode_edit_cell(index):
+            value = editor.currentData()
+            model.setData(index, value, Qt.ItemDataRole.EditRole)
+        else:
+            QStyledItemDelegate.setModelData(self, editor, model, index)