Cap Assembly, Fits Bottles with a 38 mm Cap. The Screw Ring is made of Polypro and has a Stainless Steel Band to keep the Polypro screw ring from stretching. This cap assembly also has a center that is made of PPS material (Similar to PEEK but more chemically resistant). The center has 1/4-28 threaded holes for 1/4-28 flat bottom fittings and thru holes for 1/8 in OD tubing.
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