diff --git a/src/sp/transport/inproc/inproc.c b/src/sp/transport/inproc/inproc.c
index 9b6b3b4d7..1dec45e39 100644
--- a/src/sp/transport/inproc/inproc.c
+++ b/src/sp/transport/inproc/inproc.c
@@ -35,6 +35,7 @@ struct inproc_pipe {
 	inproc_queue *send_queue;
 	uint16_t      peer;
 	uint16_t      proto;
+	nni_pipe     *pipe;
 };
 
 struct inproc_queue {
@@ -53,7 +54,8 @@ struct inproc_pair {
 
 struct inproc_ep {
 	const char   *addr;
-	bool          listener;
+	nni_listener *listener;
+	nni_dialer   *dialer;
 	nni_list_node node;
 	uint16_t      proto;
 	nni_cv        cv;
@@ -86,32 +88,16 @@ static void
 inproc_pair_destroy(void *arg)
 {
 	inproc_pair *pair = arg;
-	for (int i = 0; i < 2; i++) {
-		nni_mtx_fini(&pair->queues[i].lock);
-	}
+	nni_mtx_fini(&pair->queues[0].lock);
+	nni_mtx_fini(&pair->queues[1].lock);
 	NNI_FREE_STRUCT(pair);
 }
 
-static int
-inproc_pipe_alloc(inproc_pipe **pipep, inproc_ep *ep)
-{
-	inproc_pipe *pipe;
-
-	if ((pipe = NNI_ALLOC_STRUCT(pipe)) == NULL) {
-		return (NNG_ENOMEM);
-	}
-
-	pipe->proto = ep->proto;
-	pipe->addr  = ep->addr;
-	*pipep      = pipe;
-	return (0);
-}
-
 static int
 inproc_pipe_init(void *arg, nni_pipe *p)
 {
-	NNI_ARG_UNUSED(arg);
-	NNI_ARG_UNUSED(p);
+	inproc_pipe *pipe = arg;
+	pipe->pipe        = p;
 	return (0);
 }
 
@@ -131,8 +117,6 @@ inproc_pipe_fini(void *arg)
 		// If we are the last peer, then toss the pair structure.
 		nni_refcnt_rele(&pair->ref);
 	}
-
-	NNI_FREE_STRUCT(pipe);
 }
 
 static void
@@ -287,49 +271,34 @@ inproc_pipe_get_addr(void *arg, void *buf, size_t *szp, nni_opt_type t)
 	return (nni_copyout_sockaddr(&sa, buf, szp, t));
 }
 
-static int
-inproc_dialer_init(void **epp, nng_url *url, nni_dialer *ndialer)
+static void
+inproc_ep_init(inproc_ep *ep, nni_sock *sock, const nng_url *url)
 {
-	inproc_ep *ep;
-	nni_sock  *sock = nni_dialer_sock(ndialer);
-
-	if ((ep = NNI_ALLOC_STRUCT(ep)) == NULL) {
-		return (NNG_ENOMEM);
-	}
 	nni_mtx_init(&ep->mtx);
-
-	ep->listener = false;
-	ep->proto    = nni_sock_proto_id(sock);
-	ep->rcvmax   = 0;
+	ep->proto  = nni_sock_proto_id(sock);
+	ep->rcvmax = 0;
 	NNI_LIST_INIT(&ep->clients, inproc_ep, node);
 	nni_aio_list_init(&ep->aios);
-
 	ep->addr = url->u_path; // we match on the URL path.
+}
+
+static int
+inproc_dialer_init(void **epp, nng_url *url, nni_dialer *ndialer)
+{
+	inproc_ep *ep = (void *) epp;
 
-	*epp = ep;
+	ep->dialer = ndialer;
+	inproc_ep_init(ep, nni_dialer_sock(ndialer), url);
 	return (0);
 }
 
 static int
 inproc_listener_init(void **epp, nng_url *url, nni_listener *nlistener)
 {
-	inproc_ep *ep;
-	nni_sock  *sock = nni_listener_sock(nlistener);
-
-	if ((ep = NNI_ALLOC_STRUCT(ep)) == NULL) {
-		return (NNG_ENOMEM);
-	}
-	nni_mtx_init(&ep->mtx);
-
-	ep->listener = true;
-	ep->proto    = nni_sock_proto_id(sock);
-	ep->rcvmax   = 0;
-	NNI_LIST_INIT(&ep->clients, inproc_ep, node);
-	nni_aio_list_init(&ep->aios);
-
-	ep->addr = url->u_path; // we match on the path
+	inproc_ep *ep = (void *) epp;
 
-	*epp = ep;
+	ep->listener = nlistener;
+	inproc_ep_init(ep, nni_listener_sock(nlistener), url);
 	return (0);
 }
 
@@ -344,7 +313,6 @@ inproc_ep_fini(void *arg)
 {
 	inproc_ep *ep = arg;
 	nni_mtx_fini(&ep->mtx);
-	NNI_FREE_STRUCT(ep);
 }
 
 static void
@@ -352,12 +320,12 @@ inproc_conn_finish(nni_aio *aio, int rv, inproc_ep *ep, inproc_pipe *pipe)
 {
 	nni_aio_list_remove(aio);
 
-	if ((!ep->listener) && nni_list_empty(&ep->aios)) {
+	if ((ep->listener == NULL) && nni_list_empty(&ep->aios)) {
 		nni_list_node_remove(&ep->node);
 	}
 
 	if (rv == 0) {
-		nni_aio_set_output(aio, 0, pipe);
+		nni_aio_set_output(aio, 0, pipe->pipe);
 		nni_aio_finish(aio, 0, 0);
 	} else {
 		NNI_ASSERT(pipe == NULL);
@@ -427,21 +395,32 @@ inproc_accept_clients(inproc_ep *srv)
 			    &pair->ref, 2, pair, inproc_pair_destroy);
 
 			spipe = cpipe = NULL;
-			if (((rv = inproc_pipe_alloc(&cpipe, cli)) != 0) ||
-			    ((rv = inproc_pipe_alloc(&spipe, srv)) != 0)) {
+			if (((rv = nni_pipe_alloc_dialer(
+			          (void **) &cpipe, cli->dialer)) != 0) ||
+			    ((rv = nni_pipe_alloc_listener(
+			          (void **) &spipe, srv->listener)) != 0)) {
 
 				if (cpipe != NULL) {
-					inproc_pipe_fini(cpipe);
+					nni_pipe_close(cpipe->pipe);
+					nni_pipe_rele(cpipe->pipe);
+				} else {
+					nni_refcnt_rele(&pair->ref);
 				}
 				if (spipe != NULL) {
-					inproc_pipe_fini(spipe);
+					nni_pipe_close(spipe->pipe);
+					nni_pipe_rele(spipe->pipe);
+				} else {
+					nni_refcnt_rele(&pair->ref);
 				}
 				inproc_conn_finish(caio, rv, cli, NULL);
 				inproc_conn_finish(saio, rv, srv, NULL);
-				inproc_pair_destroy(pair);
 				continue;
 			}
 
+			cpipe->proto      = cli->proto;
+			cpipe->addr       = cli->addr;
+			spipe->proto      = srv->proto;
+			spipe->addr       = srv->addr;
 			cpipe->peer       = spipe->proto;
 			spipe->peer       = cpipe->proto;
 			cpipe->pair       = pair;
@@ -626,6 +605,7 @@ inproc_pipe_getopt(
 }
 
 static nni_sp_pipe_ops inproc_pipe_ops = {
+	.p_size   = sizeof(inproc_pipe),
 	.p_init   = inproc_pipe_init,
 	.p_fini   = inproc_pipe_fini,
 	.p_send   = inproc_pipe_send,
@@ -670,6 +650,7 @@ inproc_ep_setopt(
 }
 
 static nni_sp_dialer_ops inproc_dialer_ops = {
+	.d_size    = sizeof(inproc_ep),
 	.d_init    = inproc_dialer_init,
 	.d_fini    = inproc_ep_fini,
 	.d_connect = inproc_ep_connect,
@@ -680,6 +661,7 @@ static nni_sp_dialer_ops inproc_dialer_ops = {
 };
 
 static nni_sp_listener_ops inproc_listener_ops = {
+	.l_size   = sizeof(inproc_ep),
 	.l_init   = inproc_listener_init,
 	.l_fini   = inproc_ep_fini,
 	.l_bind   = inproc_ep_bind,