Purpose: conjoined pressure reducing valve inlet and outlet connecting pipes with meters can detect the gas cylinder volume Thread: 1/4in Inverted Male thread Color: silver Material: stainless steel Package Contents: 2 x 15 inches -1 x 1/4 inch Male NPT RV propane hose Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.