Grooved end fittings (often referred to as “Victaulic” fittings) are used to join pipes when some amount of flexibility is needed in terms of movement and deflection to the system.  This product is available in both Carbon Steel and Stainless Steel.

Grooved End Fittings for Metal Piping | Precision Hose & Expansion Joints

Stainless Steel / Carbon Steel

HOSE
SIZE
1/2 3/4 1 1-1/4 1-1/2 2 2-1/2 3 4
A 2.63 2.75 2.75 2.75 2.75 2.75 3.00 3.00 3.00
B 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00