– Triple Sealing Stem with 2 FKM O-Rings and Second Generation PTFE Seats – Blow-Out Proof Stem – 3/8" - 1/2" have 1/8" FIP Side Tap – 3/4" - 2" have 1/4" FIP Side Tap – 100% Leak Tested – 100% Made in Italy – Leakproof Stem – Lifetime Warranty – 29 in-HG Vacuum Rating