No Gas Leaks:The ball lock posts each wears a food grade standard size o-ring to prevent leakage of the connection between the ball lock and the ball lock posts; The Poppet valve each on the ball lock posts also has a standard size food grade o-rings to prevent leakage of the Poppet valve. Using the ball lock posts to convert a pin lock perfectly into ball lock. Solid and Durable:The Extra add tensile strength makes the spring is pretty stiff allowing for a strong seal. The posts, poppets and springs are made of stainless steel 304 for proper sanitation and unmatched durability. Standard SIZE:The ball lock posts have a standard 19/32inch -18 thread size. Standard corny posts are 7/8inch star on The gas inlet and 7/8inch Hex on the liquid outlet. These are both 11/16inch Hex. Make sure you put with the horizontal grooves on the gas inlet side. Standard Ball lock posts will make your installation and use easier than ever. color:Silver Material:Stainless steel Package Contents: 4 x Spare post o-ring gasket 4 x Spare poppet o-ring gasket 2 x Ball lock gas post with poppet and spring 2 x Ball lock liquid post with poppet and spring 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.