Like almost all pump firms (we do pumps not webdesign!) it's hard to search and find spares on their website. But do not despair as a Google search will take you straight to the item on the W Robinson site (among other rivals).
Unlike others sites, reasonable delivery cost which is what sold it to me and parcel arrived next day as promised.”
“Ordered and arrived the following day. Once fitted on to an oak barrel (required additional parts not supplied) I was pumping out water by hand quicker than if using a tap. Excellent pump and super fast delivery. Great feature for any garden.”