diff --git a/app/helpers/products_helper.rb b/app/helpers/products_helper.rb
index 5dce81c48e..ff1ed96b8d 100644
--- a/app/helpers/products_helper.rb
+++ b/app/helpers/products_helper.rb
@@ -20,11 +20,15 @@ def options_for_control_mechanism
   end
 
   def options_for_relay
-    {
-      RelaySynaccessRevA => RelaySynaccessRevA.name,
-      RelaySynaccessRevB => RelaySynaccessRevB.name,
-      RelayDataprobe => RelayDataprobe.name,
-    }
+    [
+      if SettingsHelper.feature_on?(:disable_relay_synaccess_rev_a)
+          nil
+      else
+        [RelaySynaccessRevA, RelaySynaccessRevA.name]
+      end,
+      [RelaySynaccessRevB, RelaySynaccessRevB.name],
+      [RelayDataprobe, RelayDataprobe.name],
+    ].compact
   end
 
   def instrument_pricing_modes
diff --git a/config/settings.yml b/config/settings.yml
index 781b69fa5e..3996548ce6 100644
--- a/config/settings.yml
+++ b/config/settings.yml
@@ -162,6 +162,7 @@ feature:
   show_daily_rate_option: true
   sanger_enabled_service: <%= ENV.fetch("SANGER_ENABLED_SERVICE", false) %>
   well_plate_alternative_csv_format: <%= ENV.fetch("well_plate_alternative_csv_format", false) %>
+  disable_relay_synaccess_rev_a: false
 
 split_accounts:
   # Roles are allowed to create Split Accounts
diff --git a/spec/helpers/products_helper_spec.rb b/spec/helpers/products_helper_spec.rb
new file mode 100644
index 0000000000..b31bdd606c
--- /dev/null
+++ b/spec/helpers/products_helper_spec.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe ProductsHelper do
+  describe "#options_for_relay" do
+    let(:subject) { options_for_relay }
+
+    it(
+      "list all relay types if none disabled",
+      { feature_setting: { disable_relay_synaccess_rev_a: false } }
+    ) do
+      expect(subject.to_h).to include(
+        RelaySynaccessRevA,
+        RelaySynaccessRevB,
+        RelayDataprobe
+      )
+    end
+
+    it(
+      "exclude synaccess rev a if disabled flag is on",
+      { feature_setting: { disable_relay_synaccess_rev_a: true } }
+    ) do
+      expect(subject.to_h).to_not include(RelaySynaccessRevA)
+    end
+  end
+end