1.25 in Square Tube Adapter– Ballistic Fabrication
7/8 in Square Tube Adapter– Ballistic Fabrication
Picatinny Buffer Tube Adaptor - Midwest Industries, Inc.
Amazon.com : Source Tactical Universal Tube Adapter for Refilling your Hydration System on the Move (Olive) : Source Uta : Sports & Outdoors
Stainless Steel Hose Connector, 3/8 in. Tube Adapter, 1/2 in. Hose ID | End Connections | Flexible Tubing | Hoses and Flexible Tubing | All Products | Swagelok
John Guest Acetal Copolymer Tube Fitting, Straight Adaptor, 1/2" Tube OD x 1/2" NPTF Male (Pack of 10): Push To Connect Tube Fittings: Amazon.com: Industrial & Scientific
Stainless Steel Swagelok Tube Fitting, Male Tube Adapter, 1/4 in. Tube OD x 1/8 in. Male NPT | Tube Adapters | Tube Fittings and Adapters | Fittings | All Products | Swagelok
Ideal Vacuum | Swagelok Tube Fitting, Male Tube Adapter, 1/4 in. Tube OD x 1/4 in. Male NPT, Stainless Steel, Part Number SS-4-TA-1-4