The hose in your picture is a standard suction hose. There are steel
wires encased in the light blue plastic that prevents the hose from
collapsing when liquid is being sucked through it by a pump.
And, you can get a hose like that from any place listed under "Spraying
Equipment & Supplies" in your yellow pages phone directory.
Similarly, since 1 1/4 and 1 1/2 inch ID are the two standard sizes for
vaccuum hoses on commercial cleaning equipment in North America, you
should also be able to buy hose like that by the foot or meter at any of
the places listed under "Janitorial Equipment & Supplies" in your yellow
pages phone directory. Phone before you drive down to those places
because some of those places will only sell cleaning supplies and
equipment, and some will do that but ALSO repair commercial cleaning
equipment. The places that repair commercial cleaning equipment will
normally have both 1 1/4 and 1 1/2 inch ID suction hose in stock.
Note that the spiral wall of the hose is a left hand thread. The BEST
way to connect these hoses is NOT to slip them over a 1 1/4 or 1 1/2
inch OD pipe and secure with a clamp. The better way would be to buy
two 1 1/4 or 1 1/2 inch hose "cuffs", screw the hose cuffs onto the
hose ends by turning them counter clock wise, and then pushing the hose
cuff onto the 1 1/4 or 1 1/2 inch OD pipes. Any and every janitorial
supply store will carry hose cuffs in both 1 1/4 and 1 1/2 inch,
especially those places that repair commercial cleaning equipment.