pipe bending spring for pe(x)-al-pe(x) pipe 1.size:16,18,20,26,32 2.certification:ISO9001 3.use for pe(x)-al-pe(x) pipe pipe bending spring for pe(x)-al-pe(x) pipe 1.size:16,18,20,26,322.certification:ISO90013.use for pe(x)-al-pe(x) pipe4.length:50cm