diff --git a/kube-core/src/labels.rs b/kube-core/src/labels.rs
index fc6302012..29df24d4e 100644
--- a/kube-core/src/labels.rs
+++ b/kube-core/src/labels.rs
@@ -21,45 +21,11 @@ pub struct ParseExpressionError(pub String);
 // local type aliases
 type Expressions = Vec<Expression>;
 
-mod private {
-    pub trait Sealed {}
-    impl<R: super::ResourceExt> Sealed for R {}
-}
-
-/// Extensions to [`ResourceExt`](crate::ResourceExt)
-/// Helper methods for resource selection based on provided Selector
-pub trait SelectorExt: private::Sealed {
-    fn selector_map(&self) -> &BTreeMap<String, String>;
-
-    /// Perform a match on the resource using Matcher trait
-    ///
-    /// ```
-    /// use k8s_openapi::api::core::v1::Pod;
-    /// use k8s_openapi::apimachinery::pkg::apis::meta::v1::LabelSelector;
-    /// use kube_core::SelectorExt;
-    /// use kube_core::{Expression, Selector, ParseExpressionError};
-    ///
-    /// let selector: Selector = LabelSelector::default().try_into()?;
-    /// let matches = Pod::default().selector_matches(&selector);
-    /// assert!(matches);
-    /// let matches = Pod::default().selector_matches(&Expression::Exists("foo".into()));
-    /// assert!(!matches);
-    /// # Ok::<(), ParseExpressionError>(())
-    /// ```
-    fn selector_matches(&self, selector: &impl Matcher) -> bool {
-        selector.matches(self.selector_map())
-    }
-}
-
-impl<R: ResourceExt> SelectorExt for R {
-    fn selector_map(&self) -> &BTreeMap<String, String> {
-        self.labels()
-    }
-}
-
 /// Matcher trait for implementing alternalive Selectors
 pub trait Matcher {
-    /// Perform a match check on the resource labels
+    type Items;
+
+    /// Perform a match check on the arbitrary components like labels
     ///
     /// ```
     /// use k8s_openapi::apimachinery::pkg::apis::meta::v1::LabelSelector;
@@ -71,7 +37,7 @@ pub trait Matcher {
     /// selector.matches(&Default::default());
     /// # Ok::<(), ParseExpressionError>(())
     /// ```
-    fn matches(&self, labels: &BTreeMap<String, String>) -> bool;
+    fn matches(&self, on: &Self::Items) -> bool;
 }
 
 /// A selector expression with existing operations
@@ -153,7 +119,7 @@ impl Selector {
     }
 
     /// Create a selector from a map of key=value label matches
-    fn from_map(map: BTreeMap<String, String>) -> Self {
+    fn from_map(map: Map) -> Self {
         Self(map.into_iter().map(|(k, v)| Expression::Equal(k, v)).collect())
     }
 
@@ -184,6 +150,8 @@ impl Selector {
 }
 
 impl Matcher for Selector {
+    type Items = BTreeMap<String, String>;
+
     /// Perform a match check on the resource labels
     fn matches(&self, labels: &BTreeMap<String, String>) -> bool {
         for expr in self.0.iter() {
@@ -196,6 +164,8 @@ impl Matcher for Selector {
 }
 
 impl Matcher for Expression {
+    type Items = BTreeMap<String, String>;
+
     fn matches(&self, labels: &BTreeMap<String, String>) -> bool {
         match self {
             Expression::In(key, values) => match labels.get(key) {
diff --git a/kube-core/src/lib.rs b/kube-core/src/lib.rs
index 15f6e88c9..809c396e8 100644
--- a/kube-core/src/lib.rs
+++ b/kube-core/src/lib.rs
@@ -52,7 +52,7 @@ pub use resource::{
 pub mod response;
 pub use response::Status;
 
-pub use labels::{Expression, Matcher, ParseExpressionError, Selector, SelectorExt};
+pub use labels::{Expression, Matcher, ParseExpressionError, Selector};
 
 #[cfg_attr(docsrs, doc(cfg(feature = "schema")))]
 #[cfg(feature = "schema")]
diff --git a/kube/src/lib.rs b/kube/src/lib.rs
index c94a8bb31..52074ff3a 100644
--- a/kube/src/lib.rs
+++ b/kube/src/lib.rs
@@ -199,7 +199,6 @@ pub mod prelude {
     #[cfg(feature = "unstable-client")] pub use crate::client::scope::NamespacedRef;
 
     #[allow(unreachable_pub)] pub use crate::core::PartialObjectMetaExt as _;
-    #[allow(unreachable_pub)] pub use crate::core::SelectorExt as _;
     pub use crate::{core::crd::CustomResourceExt as _, Resource as _, ResourceExt as _};
 
     #[cfg(feature = "runtime")] pub use crate::runtime::utils::WatchStreamExt as _;