Your search for "connectors" revealed the following:
316 Stainless Steel Plug for 1/4 in. Swagelok Tube Fitting
Rp 122.000,00
Vendor: APSS Store
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SS-400-3 – Stainless Steel Swagelok Tube Fitting Union Tee, 1/4 in. Tube OD, 316 SS
Rp 499.000,00
Vendor: APSS Store
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316 Stainless Steel Plug for 3/8 in. Swagelok Tube Fitting
Rp 137.000,00
Vendor: APSS Store
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