TP Pro-Series® Compression Release Valves Compression releases make starting your high-compression or large-displacement engine virtually effortless. Our Pro-Series® self-releasing valves are manufactured from stainless steel and topped with billet aluminum push buttons. Choose either the classic model with a smooth machined top, or our Customizable Compression Releases that feature a Shrader-threaded top manufactured to accept any custom tire valve stem cap you supply to function as the push-button.