62P-8 - Brass Compression Fittings for Thermoplastic and Soft Metal Tubing - Poly-Tite.

Parker's Poly-Tite fittings offer an acetal copolymer sleeve that has superior resilience to resist creeping and stress caused from compression.

Parflex® Thermoplastic Hose, Tubing, Fittings - LSR Distribuidor

Often used between fittings and tubes to help keep their shape, each 3/8 in. Compression Brass Sleeve and Inserts are naturally corrosion resistant.

Everbilt 3/8 in. Compression Sleeves and Brass Insert Fittings (2-Pack) 800579 - The Home Depot

Compression Fittings, Pipe & Hose Fittings, Fittings & Adapters, Hydraulics, Pneumatics, Pumps & Plumbing, Business, Office & Industrial - PicClick UK

Legines Brass Compression Tube Fitting, Union, 1/8 OD x 1/8 OD, Pack of 2 : Industrial & Scientific

B-73 - Brass Plastic Compression Tube Insert

Uxcell 8mm Tube Brass Compression Fittings, 2 Pack Insert Compression Sleeve Fitting

Brass, Union

Union: Brass, Compression x Compression, For 1/2 in x 1/2 in Tube OD, 10 PK

Parker Hannifin 62P-8 Poly-Tite Tube to Tube Union Fitting, 1/2 Compression Tube x 1/2 Compression Tube: : Industrial & Scientific

LTWFITTING 1/8 in. O.D. Brass Compression Coupling Fitting (10-Pack) HF62210 - The Home Depot