Hi Colin , he doesnt list them, so your going to have to call, or email, Dave also doesnt list several diffrent sizes of clear tube with end caps,or various valves soloniods, and a host of other goodies, he,s very handy to know , he imports these, from Dave Welch in the u.s, or Big Dave, i noticed a couple of posts asking why he wasnt replying to emails, i think there are a couple of big sub shows on at the moment,which he does attend, regards Pete