A recent advance in sorption cooler technology has resulted in cryocooler designs offering high performance and the promise of long-life operation. The advanced concepts and component performance tests are described elsewhere.) A 4 W, 130 K sorption refrigeration stage which incorporates the advanced concept design is presently being constructed. Powdered charcoal is used as the sorbent and methane is used as the refrigerant. Expansion is accomplished using a passive Joule-Thomson (J-T) expansion valve. The design details of this cooler and the component performance test results will be discussed in this paper