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A circumferential clamp and centering ring form the vacuum seal between the connecting flanges (please see top right figure - click to enlarge)
Application temperature < 150° F / 65° C
Electrical isolation up to 2KV
KF25 / NW 25 / QF25 flange
Tailor-made is also acceptable
1/4" FNPT X KF16 flange PVC-OD A circumferential clamp and centering1 4" FNPT to KF16 Stainless Steel 304 Vacuum adapter NPT thread strictly follows US standard 60 degree thread angle 18 threads per inch end to end length 30mm 1 4" NPT Major OD is 0. 54" Self sealing with PTFE tape or liquid sealant
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