Your search for "connectors" revealed the following:
SS-400-C – Stainless Steel Swagelok Tube Fitting Cap, 1/4 in. Tube OD, 316 SS
Rp 117.000,00
Vendor: APSS Store
View Product
Ledlenser H15R Core 2500lm Rechargeable IP67 Stepless Light Dimmer Headlamp
Rp 2.654.000,00
Vendor: APSS Store
View Product