neg head pump advise

[Class of '55]

Not really advise needed on install as i definately have a negative head situation so need a negative head pump but need to do it as cheap as poss for my son and new baby.
I understand Bristan do a neg head kit which is basically a pull cord. My question is are they any good. I'm thinking of fitting a duraspeed twin with the kit. Only ever fitted neg head pumps but they haven't got cash to splash and intend moving anyway soon.

Any help or alternative solutions appreciated Guys

 

[cozzmic]

Salamander pump does flow and neg head in the same pump, think it is the CPV but go on the web site to check, good pumps too>

 

[Class of '55]

Thanks cozzmic.
I've seen the sally and it does seem a good pump. I think it's the one that 'adjusts' to posi/neg pressures. Trouble is the cost. I can get a twin pump for about £150/70 and with the Bristan kit another £30 and save a bit. i think the cpv goes at about £300. The cost is a factor here so need to keep it to a minimum

Steve