This is a Felt Filtered Gas Clunk (LARGE)
It features a felt filter that will not suck air if fuel is touching it. It also has an integrated mesh screen filter in between the felt filter and fuel pickup. Excellent for Gas installs. Must be used with 1/8" or 3/16" I.D fuel line (not suitable for 3/32" I.D. fuel line). Suitable for large displacement engines (over 150cc).