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DaveDCB
Well-known member
With a cross head shape on the inside of it? Sounds similar to afew jcb ones I’ve seen, but on them I’ve always been able to get an adjustable onto them.Thought I took a pic. Basically a square peg on top of the cap 27mm. I couldn't get a spanner or strap on it due to it's proximity to all the pipework. Took a file to the corners once I got it off and spanner fitted ok
One of these is handy too
Adjustable Basin Wrench 13mm-40mm - Screwfix
Order online at Screwfix.com. Ideal for reaching, tightening and loosening most 15 and 22mm pillar and bath tap back and union nuts. Features durable iron rod handle and adjustable pivoting head with hardened steel jaws to offer easy installation and removal of taps. FREE next day delivery...