Combined T and Crossover for 48mm Galvanised Pipe D3VD03 the knuckle is secured with

the knuckle is secured with a standard setscrew

A water based primer/undercoat is not a necessity (although it wouldn’t hurt)

Oak (either Australian oak or American red oak)

The 123 B34 is a Variable 40 degree to 70 degree angle joint

Combined T and Crossover for 48mm Galvanised Pipe D3VD03 the knuckle is secured withWhere would you normally use this galvanised pipe fitting? The 165 Combined Tee & Crossover B34 is often used in racking and similar structures. This fitting allows both uprights and front and rear horizontal rails to be continuous. It is usually preferable for the upright to be on the outside of the structure (as per the photo) for maximum stability. The through tubes cannot be joined within the fitting. What size pipe does it fit to? This fitting