Shurflo pumps with a 1/2" male BSP inlet and outlet thread must use the "Wingnut" hose adaptor when connecting any hose to the pumps. This is the 1/2" wingnut x 10mm or 3/8" elbow hose barb and you will normally need 2 of them.
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Very pleased with the service. Parts were exactly as ordered & delivery was as prompt as COVID-19 mail allows. Will order from this friendly firm again.
Excellent service and top quality parts