I have been unable to find any info about the head on a recently purchased aluminum sailboat (built about 1975 in Toronto, Ontario). The only identifiers I found were on the seat - Elmal SL400. It is a compact head which sits on a 4-inch high platform cout out at the back to accept the outlet which is lower than the base of the head itself. The pump (behind the head ) is worked using a long handle coming up the side of the head. Does anyone have some helpful information? Thanks Terry on Windancer