We own a mid 70’s Pearson 10M. There’s a wash-down connector at the bow of the boat but we’ve not found a connector/adaptor for this hook-up on the boat. I purchased a Jabsco Quick connect adaptor (which I think is fairly standard) but it does not fit our boat’s wash-down connector (shoulder too large). Any suggestions on what other type of connector adaptors are used? The wash-down connection is a simple stainless steel fitting without any names on it (photo attached). Thank you