Square cross section O rings

[RCO]

Does anyone know where I can buy some square cross section O rings other than buying on line? I bought some from The O Ring Store (SN70113) but tore them up on a bad section in my pump tube. Seems that on my 2015 Benjamin 392 where the did the letter stamping they distorted the tube. I got that fixed and am running round O rings but what to use the square ones.

If I have to order It's like less than $1.00 for the rings and over $6.00 for shipping.

[Big Bore Bart]

Try looking for a local Hydraulic shop.  A lot of cylinders use Quad rings .